OT? HELP: NON profit org. conflict.. Guild charter limitations

A question has come up in our guild.....our president wanted to give back to
the entire group for such a fine job that was done at our quilt show....so
she arranged a workshop that she has offered to guild members for
free....here is the question....we are an incorporated non-profit
organization and so one of our members pointed out that there are IRS
"admonitions"/rules about non profit organizations using group funds for the
benefit of the members only....the general thought is to offer a certain set
number of slots for the workshop for the general public and the balance to
the membership....
Has anyone had to deal with this issue in your guild or other non profit
organization? And how did you address it?