Father&Son - is it wagering?
Milan - I suggest you keep that agreement quiet, and ask your son not to talk about it at the event. It's not really even borderline, in my opinion - but I won't be the judge at this event. Also, if players hear about it, their misunderstanding re: bribery&wagering may lead to bad decisions on their part, or they may accuse you of things, etc.
d:^D
P.S. - fun idea!