diff --git a/backend/karaoqueue-backend/src/containers/appState.container.ts b/backend/karaoqueue-backend/src/containers/appState.container.ts
new file mode 100644
index 0000000..1524a6d
--- /dev/null
+++ b/backend/karaoqueue-backend/src/containers/appState.container.ts
@@ -0,0 +1,14 @@
+import AppState from "../models/appState.model";
+import fs from "fs";
+
+const appState = new AppState();
+
+if (fs.existsSync("/tmp/.kqueue_eventlock")) {
+    appState.currentlyInEvent=true;
+} else {
+    appState.currentlyInEvent=false;
+}
+
+appState.registrationEnabled=false;
+
+export default appState;
\ No newline at end of file
diff --git a/backend/karaoqueue-backend/src/controllers/queue.controller.ts b/backend/karaoqueue-backend/src/controllers/queue.controller.ts
index 0e4738e..3133f95 100644
--- a/backend/karaoqueue-backend/src/controllers/queue.controller.ts
+++ b/backend/karaoqueue-backend/src/controllers/queue.controller.ts
@@ -1,4 +1,7 @@
-import { Controller, Get, Res, Post, Delete, Patch, Req } from "routing-controllers";
+import { Request, Response } from "express";
+import { Controller, Get, Res, Post, Delete, Patch, Req, Authorized, CurrentUser } from "routing-controllers";
+import appState from "../containers/appState.container";
+import DataStoredInToken from "../interfaces/dataStoredInToken.interface";
 
 
 @Controller("/queue")
@@ -8,25 +11,33 @@ export class QueueController {
      * Fetch entry Queue content
      */
     @Get()
-    getQueue(@Req() req: any, @Res() res: any) {
+    getQueue(@Req() req: Request, @Res() res: Response) {
         res.setHeader('Content-Type', 'application/json');
-        res.end(JSON.stringify({ placeholder: "//TODO fetch" }));
+        res.send(JSON.stringify({ placeholder: "//TODO fetch" }));
+        return res;
     }
 
     /*
      * Add entry to Queue
      */
     @Post()
-    addEntry(@Req() req: any, @Res() res: any) {
+    addEntry(@Req() req: Request, @Res() res: Response) {
         res.setHeader('Content-Type', 'application/json');
-        res.end(JSON.stringify({ placeholder: "//TODO add" }));
+        if (appState.registrationEnabled) {
+            res.send(JSON.stringify({ placeholder: "//TODO add" }));
+        } else {
+            res.status(403)
+            res.send("Entry submission is currently not allowed.")
+        }
+        return res;
     }
 
     /*
      *
      */
     @Delete()
-    clearQueue(@Req() req: any, @Res() res: any) {
+    @Authorized()
+    clearQueue(@Req() req: Request, @Res() res: Response) {
         return "//TODO clear";
     }
 
@@ -34,21 +45,32 @@ export class QueueController {
      *
      */
     @Get("/:entry:id")
-    getEntry(@Req() req: any, @Res() res: any) {
+    getEntry(@Req() req: Request, @Res() res: Response) {
         res.setHeader('Content-Type', 'application/json');
-        res.end(JSON.stringify({ placeholder: "//TODO get" }));
+        res.send(JSON.stringify({ placeholder: "//TODO get" }));
+        return res;
     }
 
     /*
      *
      */
     @Patch("/:entry_id")
-    editEntry(@Req() req: any, @Res() res: any) {
-        return "//TODO edit"
+    editEntry(@Req() req: Request, @Res() res: Response, @CurrentUser() user?: DataStoredInToken) {
+        if (user) {
+            return "You're "+user._id;
+        } else {
+            /*TODO: Require song-specific auth to modify queue entry */
+            return "You are not logged in."
+        }
     }
 
     @Delete("/:entry_id")
-    deleteEntry(@Req() req: any, @Res() res: any) {
-        return "//TODO delete"
+    deleteEntry(@Req() req: Request, @Res() res: Response, @CurrentUser() user?: DataStoredInToken) {
+        if (user) {
+            return "You're " + user._id;
+        } else {
+            /*TODO: Require song-specific auth to delete queue entry */
+            return "You are not logged in."
+        }
     }
 }
\ No newline at end of file
diff --git a/backend/karaoqueue-backend/src/controllers/rpc.controller.ts b/backend/karaoqueue-backend/src/controllers/rpc.controller.ts
index e6d7ccb..cb43a28 100644
--- a/backend/karaoqueue-backend/src/controllers/rpc.controller.ts
+++ b/backend/karaoqueue-backend/src/controllers/rpc.controller.ts
@@ -1,25 +1,52 @@
-import { Controller, Get, Param, QueryParam } from "routing-controllers";
+import { Response } from "express";
+import { Authorized, Controller, Get, Param, QueryParam, Res } from "routing-controllers";
+import appState from "../containers/appState.container";
+import fs from "fs";
 
 @Controller("/rpc")
+@Authorized()
 export class RpcController {
     @Get("/start_event")
     doStartEvent() {
-        return "//TODO start_event"
+        /* TODO: Wipe state (queue and song playbacks) when starting new event. Maybe also refresh Song database automatically? */
+        appState.currentlyInEvent = true;
+        fs.openSync("/tmp/.kqueue_eventlock", 'w')
+        return 200;
     }
 
     @Get("/end_event")
     doEndEvent() {
-        return "//TODO end_event"
+        appState.currentlyInEvent = false;
+        fs.unlinkSync("/tmp/.kqueue_eventlock");
+        return 200;
     }
 
     @Get("/enable_registration")
-    doEnableRegistration() {
-        return "//TODO enable_registration"
+    doEnableRegistration(@Res() res: Response) {
+        if (appState.currentlyInEvent) {
+            appState.registrationEnabled = true;
+            return 200;
+        } else {
+            res.status(403).send("No event currently active")
+            return res;
+        }
     }
 
     @Get("/disable_registration")
-    doDisableRegistration() {
-        return "//TODO disable_registration"
+    doDisableRegistration(@Res() res: Response) {
+        if (appState.currentlyInEvent) {
+            appState.registrationEnabled = false;
+            return 200;
+        } else {
+            res.status(403).send("No event currently active")
+            return res;
+        }
+
+    }
+
+    @Get("/get_state")
+    doGetState() {
+        return appState;
     }
 
     @Get("/get_playstats")
diff --git a/backend/karaoqueue-backend/src/models/appState.model.ts b/backend/karaoqueue-backend/src/models/appState.model.ts
new file mode 100644
index 0000000..c89aadb
--- /dev/null
+++ b/backend/karaoqueue-backend/src/models/appState.model.ts
@@ -0,0 +1,6 @@
+class AppState {
+    registrationEnabled: boolean;
+    currentlyInEvent: boolean;
+}
+
+export default AppState;
\ No newline at end of file