Fill event room topic by currently playing event name

[MurzNN]

Is your feature request related to a problem? Please describe.
Will be good to automate filling a room topic to currently active event, because it's not easy to understand which event is going now, you need to go to the "Schedule" event (that is not so easy to find for newbies) and scroll down to green indicator.

Describe the solution you'd like
Fill event room topic by currently playing event name by bot.

[ghosty-be]

I had the same idea, however for FOSDEM devrooms tend to set their own topic already, so if you change it by bot when talks happen it should add it to the topic and not replace the whole topic I guess (or give the option of preserving topic)