Many of us wish for a way to exclude holiday music. In the meantime, how about this work-around:
Create a new playlist - name it Christmas. Put all your Christmas albums in it.
Create a new playlist - name it All but Christmas, or similar.
Select it as the current playlist.
Choose "Combine Playlists."
Append > "All Music" to "All but Christmas"
Choose "Combine Playlists."
Subtract > "Christmas" from "All but Christmas"
Now you can play everything but Christmas music, either sequentially or randomly.