If I decide to take the on campus option for the fall, but a travel restriction or other scenario arises that prevents me from traveling to the U.S., can I change my selection to opt-in to the online option, even after the deadline has passed? (Added June 24)

No. Students should opt-in to the online option by July 6 (undergraduate) or July 15 (graduate). These deadlines have been extended to give students additional time to make this decision.