outdoor wedding 3.5 month old

My sister is getting married when my baby will be 3 and half months old. I was wondering any advice you have. we are flying so we won't have much there other than one crib and a couple toys we will bring with us. should I bring my pump so I can try to get her to use a bottle or would excusing myself to breastfeed be ok (I'm a bridesmaid) my breasts do hurt if I don't feed my baby every few hours. They also get hard if I don't. my mom is insisting I. need to pump. that's also an extra thing we would have to being with us. what can you do to make your baby happy. the wedding should be in the evening so it hopefully won't be sunny. my mom just wants me to hold her the whole time but I'm not sure my baby would be ok with possibly not being put down for 4 hours. How to politely tell your family and bride a nd groom's friends that you don't want anyone holding your baby apart from your immediate family? I know my mom will be extremely mad that I don't want extended family touching her during the wedding day but I don't want my baby to get sick or agitated by a lot of people.