I'm a professional. Whenever something goes wrong on stage, I know how to handle it so no one ever remembers. I flash my %#$&.
"Jayne just sat there while Gina flailed around the stage like an idiot."
Will those shows still be selling those items at that point?
"The sexual energy between the mother and son really concerns me!"-random woman behind me at Next to Normal
"I want to meet him after and bang him!"-random woman who exposed her breasts at Rock of Ages, referring to James Carpinello
Honestjs - Broadway Cares Equity Fights Aids sells signed posters and playbills for their organization 2x a year. Their spring sales are ending this weekend and they are totaling up the income this weekend for their big Easter Bonnet performance next week. Perhaps someone (I can't because I'm unavailable) would be willing to go to the theatres to pick these up for you and you can pay them with a check or via paypal and you can pick them up when you arrive. I would also try contacting the BCEFA office or the individual theatres for help...you could probably find the right person by going to the show's personal website.
They are participating. The night we were there the show ran too long because of the stop for tech stuff so they didn't do it. But they usually sell posters, playbills, and a company cookbook.