I am interested in participating in whatever comes of this. Often times I've found myself wanting to bring food to parties, but not doing so for fear of interfering with the plans of whoever's organizing. A more organized group (a food board, if you will) would help reduce situations like that. However, I think making it something exclusive would be too official, and out of the sync with the spirit of the hackerspace. It's a big responsibility for a group of people to take on, and if there's a way to keep it casual, I think that's the best way to go. A general interest group that's always open to new volunteers and suggestions would probably be good. Before big events, we could just remind people that a group of people exists that's interested in organizing food, and that they'd be happy to have help.
As for the funding of weekly meals, my suggestion is to simply put out a tip bucket with a sign for a couple of weeks and see where that takes us. It could say something like "Donations for next week's meal are always appreciated!" or something like what the keg currently says, along the lines of "Food is free! Donations keep it that way." If we're getting very few donations after a couple of weeks, maybe then we could bring it up in a Tuesday meeting, just to let people know that the issue exists, and that any contributions of food or cash is great. On the other hand, this seems like an awful lot of serious and frustrated planning for what's supposed to be an optional pot luck. Ben, thank you so much for all that you've contributed. You didn't have to step in and take the role of the main course maker, but that's what you've been doing. I would like to suggest though that no one feel obligated to make enough food to feed 30ish people. Maybe we should back off a little and make it more of a true pot luck. Encourage people to bring what they can. Some weeks we'll feast, some weeks we won't. But I think right now people come on Tuesdays expecting a meal. Backing off on a main course would probably encourage people to bring food. At the moment, maybe they feel like they don't really need to because someone (you, Ben) will probably do it.
I'm rambling, sorry. My point is, maybe it should be kept casual for a while before any major weekly planning starts to happen. Just a tip jar, and more encouragement for people to contribute.