We did something similar for my daughter's Eurovision party! It was fun. For us, definitely more low key than this - we walked the aisles of Trader Joes and bought anything remotely european.
Also - apps are fun and a good way to start. I'm wondering about desserts, because an international dessert bar is even more fun.
Spanish cheeses and tapenade.
Portugal - not Trader Joes, but Lidl sells portuguese custard tarts in the bakery and they are pretty good
Belgium - TJ has an amazing butter belgian waffle cookie that I've always overlooked but they are tasty and feel more high end. Thin, crispy, a touch sweet but not too much - great on a dessert table or with after dinner coffee.
etc etc
We did not do any asian food (Eurovision), but the frozen aisle has all sorts of options.