Not sure if you already planned this but name tags really help! I have been to so many swaps where they don't use name tags and it gets really frustrating trying to find people!

This is more for future swaps, but many swaps do incentives to get people on fragswapper. This really increases pre-sales and gets people excited and involved a few weeks before the swap. I know of many reefers that will judge a swap by whats on fragswapper, so if stuff is moving you might draw more people in. You could do a free raffle ticket for every 3 items listed on fragswapper or something along those lines.