Where to meet people in their 30s in London

Hi

I just move back to London after 17 years and I wondering where the people in their 30s are ? We're not all married or love to get drunk the Thursday night!  I love to do simple thing and I'm not a difficult person but it's close to be impossible to find that type of person.
I just want to make new friends in a new city.

Like for new year I think I will go to the firework if you want to come (20s are welcome!)

Well if your are interesting let me know.

Vero

Hello. I'm a filmmaker/writer and photographer here in London, from Hollywood, and would love to make new friends.
Been traveling alone awhile, made many friends along the way, and would love to make more. New years day (late Sunday night), and Monday I'm free. Email me..my email is on my profile.

Welcome back btw! Let's have fun in London! :)

Suggest:

Dance classes?
Karaoke nights?