I am pretty sure there are English teaching jobs and volunteer work available. Venezuelans are very geared towards family life, and not very open to foreigners. My expat friends while I lived there had to rely on the expat community for making friends. If it's an evening event and they say casual, think cocktail for women. Men are more relaxed.
Women are usually very overdressed for all occasions.
Venezuelans have a reputation for being one of the most vain people in South America. Jackets for men are required in many restaurants. No matter how hot it is, do not go out in shorts unless you want to get mugged for looking like a gringo with lots of dollars. Local doctors educated and trained in the US are available and private hospitals are far superior to what I have seen in Peru and Costa Rica. Dry season can very hot.