If anything they will get drunk during the event as Cathy kinda of implied when she invite them. Being such a small event I don't think it will lead to much action in any case. Maybe some touching when they greet to part away at the end?
Also Sam's event is optional while this is not. So for her to be drunk, either she gets it from the concert or for some reason she has to drink alone while she's home waiting for Liam (and being at the concert). Possible, but it has to be explained. My guess is that even if she is tipsy from the concert she will recover (or as we often say, reset) by the beginning of this event and the event will be the same no matter what happened before.
About the luggage, ok we know it is a prop from the asset and probably it has no meaning in the story. Just for the speculation fun, I see many said that Andy will leave and they will be asked to keep an eye on Cathy. What if Cathy is then invited to stay at Parker's for few days while Andy is out? That would be a good setting for developing the routes.