I heard back from the person I spoke to on the phone yesterday after sending my initial message and she echoed the same thing that folks above have learned: you can do non-Saturday-to-Saturday, but only within 90 days of your planned travel dates. This isn't at all helpful for me. I know my spring holiday dates for the next three years due to how university calendars are constructed. Still quite disappointed by this decision from an operation I had enjoyed visiting numerous times.