Hi Jim. Just a few thoughts , I get where your coming from re OM and I while I agree with finding out what sort of a bloke he is I'm not sure what you will learn going for a drink and I think it would be incredibly awkward. Not sure what to suggest otherwise either !
I'm no expert on any of this so its just my thoughts but it's a minefield for you with the ages your children are All You can do is what you are doing and being a great dad.
On the GAL , is there something your into ? Not extreme sports like Sotto but more mundane things like stock car racing or paragliding !!