Breastfeeding at a wedding (guest)

Hi all! I'll be attending a wedding today and I wanted your opinion on pumping at the wedding. Would it be inappropriate to bring my breast pump in the bathroom there? I imagine I would just need to do it once. I didn't have enough time to order an adapter for my car with my spectra (and I was gifted a Medela so I thought it had the option of battery operated turns out it doesn't and I didn't investigate it til 2 days ago). Anyway, what would you do if you exclusively breast feed and you don't want to become engorged? I don't have a manual breast pump 😣 I feel like if I do it in the bathroom, it'll be a big scene since I have to be plugged into the wall. We're not staying over so I can't go to a hotel to do it.