Wedding Officiant - health situation , need last minute easy to schedule officiant or walk in wedding chapel

I have a serious medical issue and my partner and I want to be married before surgery. Anyone know if there is any kind of walk in wedding chapel / last minute officiant available? (lgbt accepting) My health is unstable and its hard to schedule things a bit, so hoping for something with hours where you could walk in or call on a good day or be understanding for us. If there is no walkin type chapel or service like this, someone who could meet us near the courthouse or another easy location to get to would be helpful.