Advice

Hiii so I’d appreciate any advice on how to go about this.. My grandma is planning a big family reunion soon it will be at a park. I’m a new mommy my sons 6 months old and I’m really not comfortable with having him around a big group of people with covid still being around even though it’s going to be outside I’m just not comfortable with it and I know a lot of people will want to see and hold my baby and plus a lot of them are coming from out of state. My grandma keeps mentioning it and asked if I could bring something to it but how do I tell her I’m not comfortable going with my baby? I know she’ll probably be upset but my first priority is my son. I just don’t really know how to word it so she’ll be understanding. Thanks in advance ❤️