Here's the most wonderful FREE link for printable 2010 calendars!
Photo copyright serif.co.uk
You can download as a Word doc (which means you can type in your own entries, then print it off) or as a downloadable PDF. There is also a wide choice of formats and layouts, including a wallet size.
And you can even print off the rest of 2009 - all ready for planning the party season.
I'll be working out which size would fit inside a Filofax-style organiser - it'll be so nice to type the entries (not only will they fit, I'll be able to read them too!)