hrm. since that is what seems to be common to a variety of different faiths (i wonder if there is something occurring around then in most religions?) why not make the official holiday a holiday of the solstice?

then different religions could teach people about the various holidays they have and how they came to be associated with the solstice...

and in the spirit of the seperation of church and state the christian church wouldn't dictate when people had to close their shop or pay overtime or whatever...