diff --git a/app/game-engine/test/monthlyNationLevelPersistence.integration.test.ts b/app/game-engine/test/monthlyNationLevelPersistence.integration.test.ts
index f6a7633..16bce53 100644
--- a/app/game-engine/test/monthlyNationLevelPersistence.integration.test.ts
+++ b/app/game-engine/test/monthlyNationLevelPersistence.integration.test.ts
@@ -5,6 +5,7 @@ import type { City, ItemModule, Nation } from '@sammo-ts/logic';
 import { createDatabaseTurnHooks } from '../src/turn/databaseHooks.js';
 import { InMemoryTurnWorld } from '../src/turn/inMemoryWorld.js';
 import { createUpdateNationLevelHandler } from '../src/turn/monthlyNationLevelAction.js';
+import { createMonthlyEventHandler } from '../src/turn/monthlyEventHandler.js';
 import { InMemoryReservedTurnStore } from '../src/turn/reservedTurnStore.js';
 import type { TurnEvent, TurnGeneral, TurnWorldSnapshot, TurnWorldState } from '../src/turn/types.js';
 
@@ -216,7 +217,7 @@ integration('monthly nation level database persistence', () => {
             data: {
                 scenarioCode: 'monthly-nation-level-persistence',
                 currentYear: 193,
-                currentMonth: 2,
+                currentMonth: 1,
                 tickSeconds: 600,
                 config: {},
                 meta: { hiddenSeed: 'nation-level-persistence', killturn: 1_000 },
@@ -225,7 +226,7 @@ integration('monthly nation level database persistence', () => {
         const state: TurnWorldState = {
             id: stateRow.id,
             currentYear: 193,
-            currentMonth: 2,
+            currentMonth: 1,
             tickSeconds: 600,
             lastTurnTime: new Date('2026-07-25T00:20:00.000Z'),
             meta: { hiddenSeed: 'nation-level-persistence', killturn: 1_000 },
@@ -252,24 +253,26 @@ integration('monthly nation level database persistence', () => {
             events: [event],
             initialEvents: [],
         };
-        const world = new InMemoryTurnWorld(state, snapshot, {
-            schedule: { entries: [{ startMinute: 0, tickMinutes: 10 }] },
-        });
         const reservedTurns = new InMemoryReservedTurnStore(db, { maxGeneralTurns: 30, maxNationTurns: 12 });
         await reservedTurns.loadAll();
+        let world: InMemoryTurnWorld | null = null;
         const handler = createUpdateNationLevelHandler({
             getWorld: () => world,
             reservedTurns,
             itemModules: [uniqueHorse],
         });
+        world = new InMemoryTurnWorld(state, snapshot, {
+            schedule: { entries: [{ startMinute: 0, tickMinutes: 10 }] },
+            calendarHandler: createMonthlyEventHandler({
+                getWorld: () => world,
+                startYear: 190,
+                actions: new Map([['UpdateNationLevel', handler]]),
+            }),
+        });
         const dbHooks = await createDatabaseTurnHooks(databaseUrl!, world, { reservedTurns });
 
         try {
-            await handler(
-                [],
-                { year: 193, month: 2, startyear: 190, currentEventID: 1, turnTime: state.lastTurnTime },
-                event
-            );
+            await world.advanceMonth(new Date('0193-02-01T00:00:00.000Z'));
             await dbHooks.hooks.flushChanges?.({
                 lastTurnTime: state.lastTurnTime.toISOString(),
                 processedGenerals: 0,
diff --git a/app/game-engine/test/monthlySemiAnnualPersistence.integration.test.ts b/app/game-engine/test/monthlySemiAnnualPersistence.integration.test.ts
index 8179d98..5769686 100644
--- a/app/game-engine/test/monthlySemiAnnualPersistence.integration.test.ts
+++ b/app/game-engine/test/monthlySemiAnnualPersistence.integration.test.ts
@@ -5,6 +5,7 @@ import { createGamePostgresConnector, type GamePrismaClient } from '@sammo-ts/in
 import { createDatabaseTurnHooks } from '../src/turn/databaseHooks.js';
 import { InMemoryTurnWorld } from '../src/turn/inMemoryWorld.js';
 import { createProcessSemiAnnualHandler } from '../src/turn/monthlySemiAnnualAction.js';
+import { createMonthlyEventHandler } from '../src/turn/monthlyEventHandler.js';
 import type { TurnGeneral, TurnWorldSnapshot, TurnWorldState } from '../src/turn/types.js';
 
 const databaseUrl = process.env.INPUT_EVENT_DATABASE_URL;
@@ -169,8 +170,8 @@ integration('monthly semi-annual database persistence', () => {
         const row = await db.worldState.create({
             data: {
                 scenarioCode: 'monthly-semi-annual-persistence',
-                currentYear: 193,
-                currentMonth: 1,
+                currentYear: 192,
+                currentMonth: 12,
                 tickSeconds: 600,
                 config: {},
                 meta: {},
@@ -178,8 +179,8 @@ integration('monthly semi-annual database persistence', () => {
         });
         const state: TurnWorldState = {
             id: row.id,
-            currentYear: 193,
-            currentMonth: 1,
+            currentYear: 192,
+            currentMonth: 12,
             tickSeconds: 600,
             lastTurnTime: new Date('2026-07-25T00:10:00.000Z'),
             meta: {},
@@ -203,27 +204,32 @@ integration('monthly semi-annual database persistence', () => {
             nations: [nation],
             troops: [],
             diplomacy: [],
-            events: [],
+            events: [
+                {
+                    id: 1,
+                    targetCode: 'month',
+                    priority: 0,
+                    condition: true,
+                    action: [['ProcessSemiAnnual', 'gold']],
+                    meta: {},
+                },
+            ],
             initialEvents: [],
         };
-        const world = new InMemoryTurnWorld(state, snapshot, {
+        let world: InMemoryTurnWorld | null = null;
+        const actions = new Map([['ProcessSemiAnnual', createProcessSemiAnnualHandler({ getWorld: () => world })]]);
+        world = new InMemoryTurnWorld(state, snapshot, {
             schedule: { entries: [{ startMinute: 0, tickMinutes: 10 }] },
+            calendarHandler: createMonthlyEventHandler({
+                getWorld: () => world,
+                startYear: 190,
+                actions,
+            }),
         });
         const dbHooks = await createDatabaseTurnHooks(databaseUrl!, world);
 
         try {
-            const handler = createProcessSemiAnnualHandler({ getWorld: () => world });
-            await handler(
-                ['gold'],
-                {
-                    year: 193,
-                    month: 1,
-                    startyear: 190,
-                    currentEventID: 1,
-                    turnTime: state.lastTurnTime,
-                },
-                { id: 1, targetCode: 'month', priority: 0, condition: true, action: [], meta: {} }
-            );
+            await world.advanceMonth(new Date('0193-01-01T00:00:00.000Z'));
             await dbHooks.hooks.flushChanges?.({
                 lastTurnTime: state.lastTurnTime.toISOString(),
                 processedGenerals: 0,
diff --git a/app/game-engine/test/monthlyWarIncomePersistence.integration.test.ts b/app/game-engine/test/monthlyWarIncomePersistence.integration.test.ts
index a6224bc..8282d69 100644
--- a/app/game-engine/test/monthlyWarIncomePersistence.integration.test.ts
+++ b/app/game-engine/test/monthlyWarIncomePersistence.integration.test.ts
@@ -5,6 +5,7 @@ import { createGamePostgresConnector, type GamePrismaClient } from '@sammo-ts/in
 import { createDatabaseTurnHooks } from '../src/turn/databaseHooks.js';
 import { InMemoryTurnWorld } from '../src/turn/inMemoryWorld.js';
 import { createProcessWarIncomeHandler } from '../src/turn/monthlyWarIncomeAction.js';
+import { createMonthlyEventHandler } from '../src/turn/monthlyEventHandler.js';
 import type { TurnWorldSnapshot, TurnWorldState } from '../src/turn/types.js';
 
 const databaseUrl = process.env.INPUT_EVENT_DATABASE_URL;
@@ -150,27 +151,32 @@ integration('monthly war income database persistence', () => {
             nations: [nation],
             troops: [],
             diplomacy: [],
-            events: [],
+            events: [
+                {
+                    id: 1,
+                    targetCode: 'pre_month',
+                    priority: 0,
+                    condition: true,
+                    action: [['ProcessWarIncome']],
+                    meta: {},
+                },
+            ],
             initialEvents: [],
         };
-        const world = new InMemoryTurnWorld(state, snapshot, {
+        let world: InMemoryTurnWorld | null = null;
+        const actions = new Map([['ProcessWarIncome', createProcessWarIncomeHandler({ getWorld: () => world })]]);
+        world = new InMemoryTurnWorld(state, snapshot, {
             schedule: { entries: [{ startMinute: 0, tickMinutes: 10 }] },
+            calendarHandler: createMonthlyEventHandler({
+                getWorld: () => world,
+                startYear: 190,
+                actions,
+            }),
         });
         const dbHooks = await createDatabaseTurnHooks(databaseUrl!, world);
 
         try {
-            const handler = createProcessWarIncomeHandler({ getWorld: () => world });
-            await handler(
-                [],
-                {
-                    year: 193,
-                    month: 1,
-                    startyear: 190,
-                    currentEventID: 1,
-                    turnTime: state.lastTurnTime,
-                },
-                { id: 1, targetCode: 'pre_month', priority: 0, condition: true, action: [], meta: {} }
-            );
+            await world.advanceMonth(new Date('0193-02-01T00:00:00.000Z'));
             await dbHooks.hooks.flushChanges?.({
                 lastTurnTime: state.lastTurnTime.toISOString(),
                 processedGenerals: 0,