Water the bajeezus out of them before you leave. Cut the lights off.
Hang some 1 gallon jugs with tiny pin holes in them over the plants. Or a 5-10 gallon pail with some tiny 1/16 hoses. Stick some tiny nails in the hose to slow the water to a trickle.
Just throwing out ideas. No idea really. Never tried to let a plant go over 2 weeks with no supervision, lol.
How much are you harvesting? If it's a real crop, screw the holiday. You'll be able to afford to visit for New Years.
My plants get about two feet tall and I grow in 3 gallon bags. I can over over a week without watering if I need to, and I live in the Mojave.
With the lights off, if you water them well and use a slow drip system, I bet you could make it two weeks if you *Really* need to. Just be prepared for hermies or dead plants. Hope for the best... plan for the worst.