Trying to plan out travel for the conference - when does it wrap up on the 21st? Mid-day? Evening?
Evening! Trust me you do not want to be the person who goes home early from InstructureCon! Last year Olivia Newton-John was the closing act of the evening!
The final reception will start around 5 or 6. If you want to stay for the reception (which we strongly recommend because it's so fun) leaving in the morning is probably your best bet since the airport is pretty far from Keystone.