I seem to be in a lot of groups that have this sort of issue! I recall we had some folks from the Texas Renassiance Fest performance cast come to our local Sci-fi convention here in Houston to promote the faire. I thought it was nice, as I see a lot of cross-over of Sci-Fi with the 'fantasy' of faire, and many folks I know really get into both, but there were actually people there at the con who thought it was "inappropriate" to mix ren-faire with Sci-Fi! Nothing like a 40 year old man in a Harry Potter school uniform saying some faries, princesses and elves are inappropriate at a Sci-Fi con!
Kinda off topic, but this episode of The Big Bang Theory deals with historical inaccuracies. You must watch the beginning and the very end to see the best parts. Enjoy!

http://www.youtube.com/watch?v=f5ZDY7xA1Zk
http://www.youtube.com/watch?v=EhlOI...eature=related