How Easy is it to Ruin Your Milk Supply?

I am going to a wedding that I cannot bring my baby to next week. He will be 6 weeks old exactly. We have been exclusively feeding for 5 weeks now. The first week, we supplemented with a few bottles(long story, he was early and had trouble latching) but now we've finally gotten off to a good start and I'm worried I"m going to ruin my milk supply or the BFing relationship if I leave him. I am planning on feeding him right before the wedding, then between the wedding and reception, then right after the reception. I'll most likely leave the reception before it's over but I'll probably leave a bottle or two with my parents just in case. Is my supply going to be ruined from just this one night of skipping a few feedings? Should i go out to the car to pump halfway through the reception? I probably sound crazy but we got off to such a bad start, I'm scared I'll ruin it. Also, I'm so sad to think about leaving him with a sitter, even if it is just my parents :( What if he cries for me? :(