When I eat at dinner where there is communal food, I always make sure to serve myself first, to avoid cross-contamination.
Otherwise, you get the meaty gravy covered spoon stuck in the (vegan) potatoes.
Keep some leftovers for yourself in the kitchen too, like in the pots they were cooked in, so you can enjoy them later. Your the hostess, this will be easy to do.
I've found this to be the best option as well--otherwise, the cross-contamination gets crazy, and by the time I serve myself there won't be anything for me to eat!