document events app

docs/architecture/index.mdx

@@ -92,6 +92,13 @@ integration of [GoodNews](https://goodnews.eu/). The frontend is part of the
 integration of [Voltastics](https://voltastics.com). The frontend is part of the
 [holi-frontends](https://gitlab.holi.team/app/holi-frontends) monorepo.
 
+### Events
+
+[holi-app-events](https://gitlab.holi.team/app/holi-app-events) contains the backend for the
+aggregation of external local and remote Events from platform partners like the
+[Joint Action for Sustainable Development](https://gemeinschaftswerk-nachhaltigkeit.de).
+The frontend is part of the [holi-frontends](https://gitlab.holi.team/app/holi-frontends) monorepo.
+
 ## Shared Services
 
 Some services are of such a generic nature that they can be sensibly shared between core and integration

docs/repositories.mdx

@@ -52,12 +52,13 @@ The [README](https://gitlab.holi.team/app/holi-okuna) contains further documenta
 
 ## The app repositories
 
-[holi-app-donations](https://gitlab.holi.team/app/holi-app-donations)
-[holi-app-goodnews](https://gitlab.holi.team/app/holi-app-goodnews)
-[holi-app-volunteering](https://gitlab.holi.team/app/holi-app-volunteering)
+The holi app integrates distinct components we call "Apps". These can also be developed by third parties. We have implemented four of them up to
+now.
 
-holi can integrate so called Apps. These can be developed by third parties. We have implemented three of them up to
-now. The repositories above contain their respective backend.
+- [holi-app-donations](https://gitlab.holi.team/app/holi-app-donations)
+- [holi-app-goodnews](https://gitlab.holi.team/app/holi-app-goodnews)
+- [holi-app-volunteering](https://gitlab.holi.team/app/holi-app-volunteering)
+- [holi-app-events](https://gitlab.holi.team/app/holi-app-events)
 
 ## Chat