I did some research and decided on attending a couple of camps during this summer. Specifically camps for adult beginner cellists and I thought it would be.
Inspiring musical experiences for string-playing adults. String = involving music made with strings (violin, viola, cello, bass); + Camp = Fun, learning, relaxed.
I attended this cello camp twice. It is an amazing experience. Cellists of all skill levels from beginner to very accomplished. Everyone plays in.
Summer music camps and workshops abound, and many welcome adults, from beginner to much more advanced. An online search of "summer music camps".