The grouping of conferences on the main screen is pretty basic at the moment. It differs between "Congress", "Conferences", "Events", "Broadcast" and "Blinkenlights".

Improving the grouping into finer granulated conferenceGroups is not trivial, due to inconsistent tagging of the conferences.

For a better understanding of structure and quality of the conference data, you can check out https://api.media.ccc.de/public/conferences