Fun, I think is still number one to remember now!
If you join a group, guild or society, yes I think it is important to be as close as you can for re-encactment sake. I have never been part of any groups just a observer and faire goer, so I never tried to follow the rules strictly. I do thank all the folks that do follow the rules, because those folks get the ideas going for those who embrace these faires and want to strive to increase their knowledge and their garb. It takes a long time to gather stuff up along the way sometimes to make your personna's garb complete.
The bellydancers are tribal which is new. I am going to see what would be period and get back to you all. (And Cabaret is really not faire period for sure - no sequins then)
Okay I found this quicky timeline...it mentions Ghawazee over and over...and also the reason why if I wear any belly dance items it is Ghawazee oriented. Some of the tribal groups also envelop the Ghawazee I believe as well, so they are not too far off...
Belly Dance timeline