At our venue, our guest may bring their own beer and wine (no liquor allowed per the venue)...but it has to be put into a community "trough" (for lack of a better word). I want our guests to know that we are going to purchase at least one keg, but if they would prefer a different beer or if they would prefer wine, they may bring it but it's venue policy that it has to be placed with the bartender in that "trough". How could I let them know this? Put it on the invitation? How would I word it?