To go or not go?

My sister has a graduation party, and my baby will be a week old at the time. Should we attempt to go with the baby and my toddlers? She would only be held by myself and dad. I don’t want to take any light away from my sister but I also want to be there for her because I unfortunately had to leave before she walked across the stage due to not feeling well and I know she was upset about that considering we are really close