1.create a board for Piano Society artists(pianists and composers) to announce their concerts
A concert agenda was one of the plans of Robert once. I think he/we gave up on it as there was hardly any input. I believe if there was to be a concert agenda, it should be on the main site, not inside the forum where it would be of limited interest. Actually, a pianists's page should have a link to that pianists's concert agenda.
2.create a board for reporting bugs and such
This is what the General Forum is for, as per its description:
General discussions and this is also the forum to report errors, suggestions or post feature requests.
I'd be in favour of reducing the number of forums, rather than adding to them. Some of them are of marginal interest at best.