One of the major sections of the remodel is almost finished and I'd love to have a couple of summer parties. The groups of people I hang out with love to cook so making everything myself is out of the question. We've had some great dinner parties because it seems like everyone is very inspired foodwise and they always bring amazing food. Unfortunately, two friends from different circles have become unreliable. At first it was simple things like not making enough salad or substituting rice milk for regular milk in a bechamel sauce. I have noticed over the past year they both have become worse. I don't want to ban these people from parties but I do have qualms about relying on them to follow through. Do I give them simple tasks like bringing something from a bakery? Should I offer to coach them through their preparation of their contributions? Should I prepare a standby dish just in case I need to fill the gap they have created? Or should I leave the subject alone altogether and not be such a control freak? Any opinions are welcome.