http://timesofoman.com/article/94204/Oman/Government/Prince-Charles-and-Camilla-set-to-visit-Oman-in-November. Or Her Grace?;). That'd be better.
All I know is on Saturday there's some events in Nizwa, and Misfah Al Abriyeen, like the al Azwah drums, songs, and swords, and I've seen Eid in Misfah before, it's pretty much as Interior Omani as you can get, so you might want to try your luck and see what's to be seen.
Watch out for weird traffic however. If anyone important Omani is travelling, they shut down roads sometimes.
By the way. I heard there is actually going to be an unofficial Interior Region sword fighting/dancing competition? In Bahla or Al Hamra. ...I wish Omani girls could compete:( (husband looks at me like I am a lunatic) but since I can't the next best thing is to try to force my husband to enter and take pictures right? If I can get the venue and the date and ask the guys to arrange a spectator area, I'll post that info for y'all. I love these things! (I love swords in general).