Regarding exclusive sessions, I guess, like anywhere else, it depends where you go. We tend to frequent the "ad hoc" sessions in the Fleece, Golden Lion, Station and, occasionally, the Middle Earth. While there are sometimes periods in some of them when a small group of people (often, I'm sad to say, people whose names are in the programme) seem to want to take over, the sessions in these venues always appear to welcome all comers. Likewise the Ship and the Board whe we tend to go to listen rather than join in.
Regarding the OP, the places mentioned above seemed as busy as any other year in the evenings but less so in the afternoons. I suspect the good weather may have had some influence.
Mark & Catherine.