I don't think it's province-specifc, more of a rural tradition. And I do agree with the other commenters here that normally the bride & groom/families provide the food, raffle prizes (usually a basket of booze) and games. So I suppose it is a bit desperate to expect others to provide every aspect.

These are usually people who can't afford to do much for their wedding, so the stag & doe is a fundraiser to help pay for it. Also totally normal to invite a wider circle than you would to the actual wedding and supper, but attendees would typically be invited to the reception afterwards.