According to the invitation, you only have to pay $500 to personally attend and air out your grievances. The invitations also mention feats of strength. For this I imagine a game a wack-a-barack. Plastic Obamas pop up from holes displaying campaign promises that were not kept or were successfully stifled by Republicans. Repeal Don't Ask-Don't Tell, close Guantanamo, end the Bush tax cuts, make it more difficult for people to move back and forth between public office and special interest organizations, increased government transparency, etc.
Oh the hilarity that could ensue. Nail that bastard! There you go! Look out for--damn! You broke the tax cut! BWAHAHAHAHAHAHAHAHAHA!!!
And if you're a maxed out donor, your attendance is complimentary.