What are some of the most effective community engagement campaigns a client can run?

[Deleted User]

I get asked this every once in a while or they ask what other clients are doing. I really only have a vague idea what to say or a few generic ones I might have said before like newsletters or email blasts talking about the community. I thought maybe if everyone gave ideas of stuff other clients have done or just things you thought of now it might help us all out.

-Incorporating community posts into Newsletter
-Blog article announcing the forum/community
-AMA events (though these always tend to be a bit awkward with our platform)
-Community Contests, such as "what is your innovative way to use product X".