How do you go to get togethers with an infant ?

My baby is 4 months old and we’ve been to my in laws a few times for dinner, etc but we usually don’t stay long and are usually inside . Plus they are family so it’s easy to make ourselves at home . A co worker of my husbands invited us to a cookout but it’s in the evening and I don’t want my baby’s schedule to be thrown off . Plus it’s outside and we live in the Deep South where mosquitoes are horrible (he’s too young for the baby insect repellent right now ) and it’s hot and humid . I don’t really know the co worker and there will be a bunch of other co workers there who I don’t really know . I’m just iffy about it because of having to pack up all of his things and going to someone’s house that I don’t really know and having to be in the humidity and heat . How have you gone go cookouts/outdoor events with your baby? It just gives me horrible anxiety . Plus I’m an overprotective mama 😉 I will not get a babysitter, because other than daycare and occasionally my mother n law, I let no one keep my baby. I most likely will end up not going to this event but just curious how others do it .