What exactly is an "alternative hafla"? According to their webpage, "This fun, family-friendly Middle-eastern party offers performances from a wide variety of professional and student dancers and styles. The event will have pot-luck foods and a fun raffle with lots of prizes."  The music can be anything from traditional music to tribal, fusion or folkloric as well as pop.  Sounds like a fun time!  

http://lindaness.com/veilsofthenile.com/index.html