So I know the intention with these things is good, but I showed up to my first one on Laurelin for the Anniversary and didn't manage to get anything at all. Monsters weren't open-tapping and all died within milliseconds. So seeing other people boast they managed to get cool pets etc. while standing around hoping to get lucky wasn't a great feeling and from my perspective was less of a celebration and more a waste of time. It's just a bit of a tease, especially as these events don't happen often.
If these events happen again in future, could monsters perhaps be a little tougher, open-tapping, and instead make the drops BoA but fellowship tradable? That way it doesn't matter so much if they're easier to get as it's not like people will hoard them.