IMO, with the 3-day partying of all of you, I highly doubt anyone is going to judge you for your behavior. They may have acted stupid too and you just don't remember. If you bring it up, you may find they are uncomfortable to talk about it and hope it is water under the bridge just as much as you. It would be highly unlikely that your new acquaintances would say anything, I mean, would you if they were in an alcohol-induced state and you were fairly coherent? The true you will be at that dinner, and they will see that. And if they do say anything, just laugh and tell them you don't remember a THING and you won't be doing THAT anytime soon (little do they know not at all). The best press is no press. Good luck!