Many Antigua bars and restaurants have live music with everything from salsa to rock to blues and jazz. Even Trova Cubana and Trova Jazz! There is rarely a cover charge. And the live music by Latinos in Parque Central is always free.
Some of my favorite places for live music are Café No Sé, Reilly’s Irish Tavern 0and La Pena del Sol. El Chaman is also popular with Latinos from Antigua and Guatemala City.
Belly dancing happens at Gaia Restaurant. There are two pub quizzes every week. No casinos, though. You have to go to Guatemala City to gamble.
This page has links to some of the top places: Live Music in Antigua