Help with self injection!

I am about to start my IVF self injections. My doctor told me I need to take them 12 hours apart (Menpur in the AM, Gonal-F in the PM) and the Gonal-F needs to be refrigerated.

We have a wedding to attend this weekend and will be away from home all day until late at night. I’m worried about taking my PM Gonal-F shot. How can I take it with me/keep it cool? We haven’t told anyone we are doing IVF so can’t ask for assistance. I’m thinking maybe a cooler in the car, then sneak out of the reception to do the shot?

Anyone with experience injecting on the DL or keeping the shot cool while away from home?