Is it rude to not open presents at baby shower?

Autum • Oct. 2020 ❤️

My partner and I are doing a co-ed baby shower at my mom’s house. Big house, big back yard we’ll be doing it outdoors with a tent, tables, outdoor games food out etc. A BBQ hangout type baby shower. I created a FB page to invite everyone, and as the numbers of attendees are increasing, I don’t think opening presents there will be a good idea. I can see 40/50 people there easily, and I feel like opening gifts from both sides of our families will take FOREVER. lol. I want to add we won’t be opening gifts there, so no need to wrap unless you’d like, and we can open anyone’s privately if they wish. Is this rude though?! I know lots of people like to watch that but my first shower with my son was smaller and even that took an hour. My now partner and I are expecting a little girl, and much more people attending I can’t image how long it would take. However does this mean we should also send out thank you cards? How would we obtain everyone’s address? lol!