Hi Andrea Take a look at: https://developers.google.com/calendar/overview Personally i prefer python or php. You can use crontabs to trigger the 30min event. https://docs.onion.io/omega2-docs/running-a-command-on-a-schedule.html I don't really have any expirence with the calendar api, so I can't give you an example. But I hope this may give u an idea on how to start.

I believe once the app store is available we will be able to build and publish such apps.