We are doing a pot-luck style reception instead of paying for catering due to a tight budget, and I have an idea for everyone to write what they brought and their phone number on a guestbook on the buffet table. My question is, due to rampant food allergies in my family (shellfish for me, my dad has several food allergies and so do many other guests), would it be too much to ask to have the guests label their food if it has (common!) potential allergens (ie nuts, shellfish)? I had a bad experience once with going to a potluck and none of the food was labeled, no one knew who brought what and I ate some mac & cheese that had lobster in it. I'm not asking for everyone to label everything, just those that bring common allergens so we don't have an adverse reaction that ends in hospitalization. Would this be asking too much or would it be worth it to save a lot of grief and accidents?