StackExchange is hiring a Community Evangelism Team and it is up to the community to decide what help they need.
I (as many of you are also) a member of my local skpetical group (Bristol Skeptics). There are many of these regional groups around the world all (very) loosely affiliated.
I suggest the CET reach out to these groups initially for promotion; stickers, t-shirts etc. Eventually sponsorship or events could be considered.
I have a list of contacts for all UK SitP groups, I'm sure we have users with similar contacts in US, Australia and Europe.