I'll bring the instrument I play, all right -- the human voicebox. I'm a vocalist. I'm your garden variety "Irish tenor".
My son plays the organ, but he's not even packing his smaller "travel" organ. Since we're flying, we're trying to travel light. Besides, organ doesn't fit in to an outdoor, fiddle/guitar/banjo/mandolin/tin whistle/accordion dancing music ensemble.
What songs are you likely to play? Irish folk songs? Other folk songs?
Lol... Well, voices are good to have too!!! That is neat that your sons plays the organ! Between you both that means you have enough for a choir and schola!

I am not sure what sort of music my friend plays on the accordion, but most of the music which I play is either Irish or folk. I have an big book of Irish songs, and if people are interested, I might be able to make copies of handouts for people to sing with us. I will give fair warning though that my mandolin experience is very limited.
Violin is my primary instrument, but it is a bit harder to do chords on and make it able to be sung with...
