Postpartum travel question

I'm due Sept 2. My husband and I have been talking for MONTHS about going on a day/evening trip in mid october because our favorite broadway show's touring cast will be 1.5 hours away in Memphis.

My mom has already said she'd be willing to watch my baby, and I'll be past 6 weeks postpartum at that point. I know I'll need to bring a pump with me and leave enough milk with my mom.

We'll likely leave at 3:30-4. The show starts at 7. Last for about 2.5 hours. We'll probably get home at around midnight.

Honestly, does this trip sound realistic? Some days I think I can do it and other days I'm just not sure.