This is true in most cases, like when we did the Alignment Forum sequences we released them over a longer schedule.
The goal of the day at the event I’m at is for the participants (who mostly are not used to writing blogposts on the internet) to get comfortable with / practise the whole experience of writing, publishing, and getting feedback (in person too!). There isn’t enough time left in MSFP to have them write on multiple days. And more importantly, I think for practising getting comfortable publishing (for which many folks aren’t) inserting a delay until after the event for it to be published can make it much less good, like delaying for a week on sending an email you’re worried about sending.
I think the roundups will mostly mitigate the costs of having lots of posts on one day, but agree it would be better if somehow they were distributed on multiple days.
Maybe it would also be a good idea to let the participants know that the level of online engagement on their posts is probably greatly lowered compared to if they did a post normally (without so many other posts competing for attention), so that they don’t get too discouraged from making future posts.
Also the quality of the comments may be reduced because the situation is so “out of distribution” for the forum regulars. (I keep switching back and forth between different posts instead of focusing on one and writing down my thoughts about it, in part due to too many posts vying for attention and I guess in part due to anxiety about doing a good job onboarding new participants under time pressure, and kind of have to force myself to actually comment instead of it just happening naturally.)