A goer is someone who likes going out and doing things, or an event that people attend.
When we talk about people being goers, we might mean they enjoy activities like concerts, sporting events, or festivals. They're probably the type of person who always knows what's happening in their city, and who's not afraid to try new things. For example, if someone says "I'm a total foodie and a goer," it means they love trying different restaurants and are often at new bars or clubs on the weekends.
One who, or that which, goes.
