Good call! The buses start running again at 7am (per event guide). When my family has taken the first bus at 7am from AKL (resort we were staying at) to EPCOT finish line they literally walked up to see me cross at 1:43 in 2016. So a bus from Contemporary to EPCOT may very well beat the monorail from MK to EPCOT. Would have to add in the ~0.6 mile walk from Main Street to Contemporary bus station (12 minutes) though.