Baby Shower dress for outdoor BBQ

Baby Shower is in 2 weeks and will be an outdoor Bar-B-Que family style shower. My bump is fairly small now at 34 weeks and will most likely still be petite at 36 weeks so I was originally leaning towards a short bodycon dress. However, I've officially started swelling in my feet and calves so a longer dress may be more practical 😊 I'm primarily worried about silly things- bra straps showing, armpit fat, squished boobs, constantly walking around and sitting periodically in lawn chairs, etc., so any experience with these things are appreciated!