You are not the first person I have heard of that has reported that a poly gathering was a tad creepy because people were a little too touchy or pushy. I think that this is a shame. It is something as an event organiser I very much bear in mind. The forum that I help run has a set of guidelines and expectations for our meet-ups. I won't pretend that it's original - we used lots of places as the sources, but it's at http://birdcage.wikidot.com/birdcage-get-togethers-101
if you are curious.
I suggest that you get in touch with the organiser and let them know your feelings - I would certainly want to hear about things like this, because a poly get-together should be completely non-threatening. it's hard enough for a lot of people to come out of their shells and just "be poly" - what they don't need is another barrier to feeling comfortable doing that.