Thinking of having another holiday open house this year. It's been about 8 years since our last one, but we have a new group of friends now. Here is our dilemma: in past years when finances were better, we provided all the food and drink. Now, funds are tighter. We would like to provide the wine, beer, etc and a big ham and then ask guests to bring apps, sides or desserts as a potluck. I'm not expecting gourmet offerings, a tray of brownies from the grocery store is fine. Is this rude? Would people not bother to come if they have to bring something?