At least for me, the problem seems to be that the more post-worthy something is, the more work it would be to post. The COZE report took me about a month to write, plus about a month of ignoring the almost-finished version. (I think I'd be faster at it now, though.) On the other end of the scale, keeping a list of topics discussed at pure-chat meetups wouldn't be much work, but would anyone bother to read them? I think almost all of their value could be given just by a list of "here are the sort of topics we like to discuss" for people who are on the fence about coming.
Looking at the discussion section recently, it seems like over half of the posts are meetups. I think it's really great that so many LessWrongers are able to get together and do interesting stuff. Looking at a lot of the topics, I often find myself thinking "I wonder what they ended up talking about." I looked at the meetups page and it looks like many give a description of the topic, but there is rarely any public followup. I also did a search which turned up surprisingly few post-meetup posts.
For example, this Los Angeles meetup from a few days ago about resolutions looked really interesting to me and I'm curious to hear what kinds of strategies were proposed and if there were any insights or anecdotes that came up that would be useful to share with those of us that couldn't attend.
I remember reading a meetup report back in November that told the story of the exercises they went through and it seemed to spark some good discussion. It even forced me to make a note to try some things on my own. This one was atypical in that it was very detailed and was a crosspost from a personal blog, but I feel like even short reports would give a chance for the rest of the community to chime in and give praise, suggestions, and feedback.
When I tried to think of reasons not to share what happened in meetups, I came up with a few potential factors: