Kitty would volunteer her services, devoted as she is to doing the right thing and also curious about participating in off-campus stuff.
JM isn't going anywhere. She'll stick behind with the kids, probably try to keep them inside and busy. Depending on the time of day, she might eventually set them up in the lounge so she (and whoever else) can work on getting a big meal ready for the returning heroes.
Jubilee will stay and get extra-dirty in the greenhouse.