I currently live alone. This weekend, on Friday night I am attending a Cinco de Mayo concert, then tomorrow I start with a weekly session at StretchLab and then will go to the immersive Sistine Chapel exhibit in San Jose, then will meet a former report, now friend, for coffee locally. Then on Sunday I will to to San Jose symphony and do something for exercise, biking or swimming or walking. I will also grocery shopping and cooking for the week ahead on the weekend. Then on Sunday I will have my weekly Skype call with my former teacher, now a close friend who lives overseas. If I am lucky, I will fit in some creative writing this weekend and then the weekend will be over. It is a packed weekend and I do not always stuff so many events into a weekend, but recently it has been one event or another. I either get emails from venues I visited before or I get ads for local events on Facebook: that is how I learned about the Sistine Chapel immersive. In the past I also went to Eventbrite events as @Pinny said, and I will receive email notifications about more such events, but I do not have time to go to them. If you sign up to various email updates, it is very easy to fill your schedule. There are also MeetUp, wilderness hikes if you like them, events on Facebook connected to your friends and groups, and I am sure many other outlets I am not familiar with.

You just start exploring, start going, and then you will find yourself inundated with invites to do more things similar to the ones you have already done. It will all happen in a short time. Enjoy!