have you ever been to a community theatre? 
No, I haven't!  What goes on there?
they do some plays and community theatre usually promote ideas like gender equality and human right and democracy
That sounds awesome!  I love going to plays!
and community theatre contributs to the social capital of community and develops the skills, community spirit 
You can never have too much community spirit!  It's great that communities get together and do things like that!
I agree with you! They also range in size from small groups led by single individuals to large permanent companies