Hey cinderfall I’m one of the captain’s in the Navarr Emu. I make the majority of the costume and do a lot of IC yelling. Join the Facebook group EMU Empire Lrp: Navarr (it also helps if you join Empire Lrp: Navarr while your at it if you haven’t already). Once in please vote on the various polls when they come up (lurker’s tend to get kicked after a few month’s) and enjoy ride.
As for the personal orc mask it’s an ace Idea. Ive got my own and have never looked back. As a fellow glasses wearer I personal go for one day contacts during the event. But I’ve got a tip if that’s not an option. Cut two small slits either side of the masks temple. That way you can slide the frames arms (legs? struts? stems? The bit that rest on your ears) though the slits and wear them externally.
I’ve found wearing them under the mask causes them to fog up something’s fierce.
This method also has the added advantage that the mask helps the glasses stay on.
Also those less inclided to hit a person with spectacles in /about the head and face can take appropriate action