I am part of the council of a RPG club of more than 100 members (about 50-60+ non-members attend our events as well). We organise LARPS and have been doing so for now 6-7 years I think.
We do medieval fantasy throughout the summer (5-6 games) with one event being a military tactics that we call a campaign. The LARPS last 3 days, the campaign one day. Our games usually have between 50 to 110 players (depends which one, the first one of the year is extremely popular) and between 15 to 25 NPCs.
Personnally I have ton of costumes. Musketeer, Legionnaire, Drow, Elf, Ranger... A lot. Having a wife that can sow is a great advantage. Larping is in truth my first passion, I love it. I much prefer the fantasy setting too. I also fence and took medieval swordfighting lessons. The fencing helped a lot more than the medieval swordfighting though.
We're based in Quebec/Canada in the Outaouais (Gatineau) here's the link if anyone speaks french and is curious, we have a lot of pictures as well:
www.ajjro.comThere is also in Trois-Riviere (Canada) an annual 5 days event that gathers around 2000+ players each year. Haven't been yet but planning to go soon.
www.bicolline.comI'm curious what set of rules do you guys use for Larping, especially for fantasy? We have our own homegrown rules that we've been improving every year. It on the website in "activity" under "Grandeur Nature"(LARP in french)