Sounds pre-groovy! which is I think what you want
If you have dishes/tablecloths/etc, place settings. (remember straw flowers?) anything can be retro. Just serving something in a martini glass makes it atomic age.
Was going to mention that the Mole Christmas feast that had the baked pineapple also had sopapilas to go with the chicken mole, I think any sort of bread would go nicely with the chili and shaped breads in particular are currently classified as retro and with the big wooden salad bowls and tiki forks...
edit: Think clover rolls, crescent rolls, breadsticks with seeds on them...
As are any hot appetizers, that Pepperidge Farms Puff Pastry (vegan!) is amazing to make something that takes nothing to do but set the tone with a tasty snack.