It has been included in holiday swaps in the past- we have done both a Disney one (with all the special events at Disney included) and we have done a general holiday swap that includes a variety of holidays year round. I haven't looked at this years calendar to see if either are on it at the moment.
I'll be hosting a Holidays & Special Events Swap in June...sign ups will be on June 14th. Halloween will be included in the holidays. Look for an interest thread late May/early June and that'll give you an idea of what the groups will be like. Hope you can join in!!