Auspicious dates..

Does anyone else think its important to choose an auspicious date for a festival or am I mad!?!? Okey maybe I'm mad :) I have my big wall chart open with all the different dates on it of things we have planned and things to do, and I'm trying to match up free dates with auspicious dates, cos we've got something BIG and it needs a BIG date... but I think that in reality we have to go with weekends and available venue dates. Looks like the idea dancing under the stars and a full moon on a date which brings good luck and good fortune will be drown out when it comes to dealing with suppliers and venues and providing toilets and tea for 3000 plus people! The reality is though that whenever it is, 3000 plus people are going to come together for something special and that's all GOOD :)