As far as a relaxed atmosphere we have this at many tracks that regularly get 50+ drivers. It's a few people that make it bad, not the amount of people that make it bad!!!
If as a club you make it clear that you are not gonna take any crap and then speak in private to people that do, this will keep any trouble to a minimum.
This is racing, people get into it and hearts race and emotions sore, this is part of why we do this sport!!!
I can only see more members as a positive, more money for the club, more help for the club, more fun for the club!!!
And regionals are really no different than any other meeting, our regionals are very relaxed usually with the top boys laughing with each other during the "A" final!!!