RE: AMA question
Yes contests and special events can and are held at full scale airports, the last one I was at was 05 Ralley of the Giants. Sections of the airport will close. There will be NOTAMS issued to the full scale guys and off we go.
However this is a bit different. I remember something like this was posted a year or so ago due to the problem of an RC'er hitting a paraglider. there was lots of room there too.
If there is a problem the RC'er will lose, and will wind up in court.
Do yourself a favor find somewhere else to fly. Better to error on the side of safety, than to kill a paraglider that wasnt where he said he would be(like behind you).