These are the only ways I know to reach customer support.
https://help.zazzle.com/hc/en-us/articles/221463567-How-Do-I-Contact-Zazzle-Customer-Support-
I believe Zazzle uses a 3rd party company to produce those foam core boards, and I'm not sure how quickly they can get them to you. If support tells you they can't get you one in time, one thing you might want to explore is to have the design transferred to a poster. Zazzle prints those in-house, so they have more control over printing and shipping it quickly. I did that for one of my customers who ended up in that situation once, and it worked out. The posters won't stand up without a frame or support, but I believe she ordered the poster the same size as the board was and used the damaged board as a support, attaching the poster with double sided tape.
I just looked it up and for me (I'm in Colorado) it says that if I ordered a poster today with zip plus shipping it would arrive by the 26th. So it looks like if all else fails, that might be an option for you.
Good luck, I hope it works out.
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Cat @ ZB Designs
