How to find a babysitter???

Hi ladies! I'm in a bit of a dilemma. Next Saturday night my SO and I have tickets to go see Hamilton and we are beyond excited. One problem, we cannot find a babysitter. Between her g tube, meds and her oxygen, everyone we contact says no. Usually we would have my SO's mom or cousin watch her but they are both working. Any suggestions on what we should do?? Where to look??