I have to leave my breastfed almost 11 month old for the first time

For a wedding this coming Friday. It starts at 6. His bedtime is at 7/7:30. He always nurses to sleep and doesn't take a bottle. I'm stressing out so much and feel so emotional about leaving him. I feel so guilty. I'm leaving my mother in law (who will be watching him) different baby Foods to feed him and expressed milk to try to give to him any way she can. Have any of you moms out there been in a situation like this? I need some comfort. I feel absolutely awful. Of course I'm picturing the worst scenario (him crying, wondering why I've left him and why I'm not nursing him to sleep, him being hungry etc) help!! 😞😭😩