diff --git a/src/addon/block/activitymodules/components/activitymodules/activitymodules.ts b/src/addon/block/activitymodules/components/activitymodules/activitymodules.ts
index 566ddc0b8..b46a9b366 100644
--- a/src/addon/block/activitymodules/components/activitymodules/activitymodules.ts
+++ b/src/addon/block/activitymodules/components/activitymodules/activitymodules.ts
@@ -16,8 +16,9 @@ import { Component, OnInit, Injector, Input } from '@angular/core';
 import { CoreCourseProvider } from '@core/course/providers/course';
 import { CoreCourseModuleDelegate } from '@core/course/providers/module-delegate';
 import { CoreBlockBaseComponent } from '@core/block/classes/base-block-component';
-import { CoreConstants } from '@core/constants';
+import { CoreConstants, ContextLevel } from '@core/constants';
 import { TranslateService } from '@ngx-translate/core';
+import { CoreSitesProvider } from '@providers/sites';
 
 /**
  * Component to render an "activity modules" block.
@@ -28,7 +29,7 @@ import { TranslateService } from '@ngx-translate/core';
 })
 export class AddonBlockActivityModulesComponent extends CoreBlockBaseComponent implements OnInit {
     @Input() block: any; // The block to render.
-    @Input() contextLevel: string; // The context where the block will be used.
+    @Input() contextLevel: ContextLevel; // The context where the block will be used.
     @Input() instanceId: number; // The instance ID associated with the context level.
 
     entries: any[] = [];
@@ -36,7 +37,8 @@ export class AddonBlockActivityModulesComponent extends CoreBlockBaseComponent i
     protected fetchContentDefaultError = 'Error getting activity modules data.';
 
     constructor(injector: Injector, protected courseProvider: CoreCourseProvider,
-            protected translate: TranslateService, protected moduleDelegate: CoreCourseModuleDelegate) {
+            protected translate: TranslateService, protected moduleDelegate: CoreCourseModuleDelegate,
+            protected sitesProvider: CoreSitesProvider) {
 
         super(injector, 'AddonBlockActivityModulesComponent');
     }
@@ -63,8 +65,7 @@ export class AddonBlockActivityModulesComponent extends CoreBlockBaseComponent i
      * @return Promise resolved when done.
      */
     protected fetchContent(): Promise<any> {
-        return this.courseProvider.getSections(this.instanceId, false, true).then((sections) => {
-
+        return this.courseProvider.getSections(this.getCourseId(), false, true).then((sections) => {
             this.entries = [];
 
             const archetypes = {},
@@ -122,4 +123,18 @@ export class AddonBlockActivityModulesComponent extends CoreBlockBaseComponent i
             }
         });
     }
+
+    /**
+     * Obtain the appropiate course id for the block.
+     *
+     * @return Course id.
+     */
+    protected getCourseId(): number {
+        switch (this.contextLevel) {
+            case ContextLevel.COURSE:
+                return this.instanceId;
+            default:
+                return this.sitesProvider.getCurrentSiteHomeId();
+        }
+    }
 }
diff --git a/src/addon/calendar/pages/event/event.html b/src/addon/calendar/pages/event/event.html
index 704a23bec..63f53e1e6 100644
--- a/src/addon/calendar/pages/event/event.html
+++ b/src/addon/calendar/pages/event/event.html
@@ -60,7 +60,7 @@
                 </ion-item>
                 <a ion-item text-wrap *ngIf="categoryPath">
                     <h2>{{ 'core.category' | translate}}</h2>
-                    <p><core-format-text [text]="categoryPath" contextLevel="category" [contextInstanceId]="event.category.id"></core-format-text></p>
+                    <p><core-format-text [text]="categoryPath" contextLevel="coursecat" [contextInstanceId]="event.category.id"></core-format-text></p>
                 </a>
                 <ion-item text-wrap *ngIf="event.description">
                     <h2>{{ 'core.description' | translate}}</h2>
diff --git a/src/addon/calendar/providers/helper.ts b/src/addon/calendar/providers/helper.ts
index 976c21431..a6bed59b5 100644
--- a/src/addon/calendar/providers/helper.ts
+++ b/src/addon/calendar/providers/helper.ts
@@ -144,7 +144,7 @@ export class AddonCalendarHelperProvider {
             courseId = e.course ? e.course.id : e.courseid;
 
         if (categoryId > 0) {
-            e.contextLevel = 'category';
+            e.contextLevel = 'coursecat';
             e.contextInstanceId = categoryId;
         } else if (courseId > 0) {
             e.contextLevel = 'course';
diff --git a/src/core/constants.ts b/src/core/constants.ts
index de6898658..c9784ccc3 100644
--- a/src/core/constants.ts
+++ b/src/core/constants.ts
@@ -12,6 +12,18 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+/**
+ * Context levels enumeration.
+ */
+export const enum ContextLevel {
+    SYSTEM = 'system',
+    USER = 'user',
+    COURSECAT = 'coursecat',
+    COURSE = 'course',
+    MODULE = 'module',
+    BLOCK = 'block',
+}
+
 /**
  * Static class to contain all the core constants.
  */