Tis the season to send a press release
I am not sure I fully agree with Buzzwords saying it is a time to forget about PR during the festive season while you recharge the batteries.
I certainly think you should take breaks. However, as the volume of releases decreases some journalists struggle to find the volume and quality of story they need, papers need to be filled all year round.
This summer one accountancy magazine put the word out that if you sent a release on anything approaching an accountancy subject they would publish as they were so short of stories going into the August bank holiday. They asked twice.
So yes have a break but take advantage of an opportunity.