Churrasco.
Being in a project involving a Brazilian and an Argentinian factory was cool, they had a constant all-out competition to demonstrate who had the best meat 
Vegetarians please abstain, we’re already trying to keep the inflow of carnivores down to the amount needed by project size.
Be careful (or not) with caipirinhas and caipirotas. They’re sweet drinks, so foreigners don’t realize the high alcohol content until the room starts moving funny. My Brazilian coworkers had great fun trying to get the gringos drunk. Actually, getting the gringos drunk, the only people with whom it didn’t work were myself and another “exotic”.