Hi John,
My method of dealing with this was to create a folder at artist named 'ZZZ Christmas Music'. Then name each album as normal for example 'The Best Christmas Songs Ever!' and so on.
So all of my Christmas CDs are in your 'ZZZ Christmas Music' folder.
The reason for the 'ZZZ' is that the folder only appears at the very end of any alphabetic listing, so it is out of sight. I have done this with some other categories of music that I want to retain but don't want to listen to regularly such as 'ZZZ 1920s music' etc. The 'ZZZ' is needed to place the artist folder after 'ZZ Top', the last artist in my collection. !
Then you can use the new playlist feature called 'Blacklist'. You create a playlist called 'Blacklist' (without the quotes). When you place any artist or album folder, or any music tracks into this playlist, then these items will never be played when the B2 is in random play mode. When Christmas arrives just remove the 'ZZZ Christmas Music' from the blacklist.
Just a suggestion!
Regards,
Peter.