Sorry, don't know the answer . . but I'm sure if you either do a search on the US Boards, or ask the question to our friends over there, someone will know
Don't know dates, but from previous experience it is the end of January into February as the competitiions run over 3-4 w/ends. To be fair though, it did not really affect park crowds, but value resorts, e.g. All stars were busy
thanks anyway we stayed in CBR last Jan when they were about and you waited in line for brekkie over an hour and couldn't get on the shuttles so i am trying to avoid them this time