Okay - so unfortunately we can't invest in a scheduling software at this time. So we're creating a landing page for customers to schedule a 30-min appointment for a trade show. We have two fields (Desired Date and Alternate Date). Is there a way to make it so that if someone chooses April 10th as their desired date that that specific date is hidden or not included in the alternate date to prevent them from selecting the same date twice?
you can do this with some visibility rules on the alternate date. See Dynamically Toggle Visibility of a Form Field - Marketo Docs - Product Documentation