Speed friending was pretty great
I tried hard to have full 5 minutes of conversation and at least in my opinion I didn't have a single bad match.
Lightning rounds were fun, even though the topic was "lmao lightning round is really short haha" most of the times.
I found group rounds to be mostly misses though. Not because of bad matchups, but mostly because it felt like people (including me) didn't really know what to do with it.

All in all I wish it would be more often. Maybe not every month, but certainly once every 3 month would be really cool!