Thalamus was built to allow programs to lock cancellations and sign ups on interview events, independently or all together. (i.e. prevent cancellations 3 days prior to any interview date; lock sign ups two weeks prior or over a holiday week, etc.).
The lock out intervals are dynamic, editable, and able to be changed at any point throughout the interview season.
Additional information about Lockout intervals, sign up and cancellation can be found here: