The museum will be offering some merchandise (you should pick up the book!), but I don’t believe there will be anything for sale from the club, and certainly no trees for sale. The focus of this event is celebrating local bonsai and outreach to the non-hobbyist/artist community. The volunteer coordinator for the museum described it to me as “everything you could imagine at a bonsai event besides an auction.”
You just missed the club sale, but there is auction coming up on June 1st, also at the museum , that you won’t want to miss.