I really like these initiatives. It creates a support network to help early startups get to market. However there seems to be lots of these popping up and you

I really like these initiatives. It creates a support network to help early startups get to market. However there seems to be lots of these popping up and you start to question the longevity of these groups. I am sure these are started with good intentions however what are the motivations of the organizers? Is it simply the buzz of being involved and sharing ideas/stories/support? I am not trying to criticize the groups, but interested in the risks of getting involved in these events/communities? Do you need to be cautious of anything? How do you select the right group or groups to join?