Complex sentence: Basement shows can also be much more fun as they often double as parties and many people stay after the show and continue to hang out, thus they are great social events and meetups, and in some cases, places to drink.
Split into simpler sentences: Basement shows can also be much more fun, as they often double up as parties. Many people continue to hang out after the show, and thus, they are great social events and meet-ups, and in some cases, places to drink.