Start paying attention to community bulletin boards

In your local coffee shop, in the public library, in the entrance to the gym, wherever. Challenge yourself to attend one class/performance/event/etc. per quarter. For an extra layer of adventure, you can (a) go by yourself, or (b) invite someone you've been wanting to get to know better. I don’t know you, so perhaps none of this is outside your comfort zone! But it is for me :)