This year, instead of having just an ordinary Choir, we are having a Ukulele Choir (no name yet - any good ideas to Cara!) We are planning to go to the Ukulele Festival in November, and join in with all the fun there. 
The children have learned to play about 6 chords, and can now play lots of songs. They find they get sore fingers, but they will toughen up.  
Ukulele's are a lot of fun, and not too hard to learn to play. There are lots of helpful videos and web pages on the internet if you want to have a go!