Modifying a date in the past

Hello. I need to change a date on a form and it does not allow me to pick a date that already passed. I understand it may not make sense to register a person for something that already passed, but the change is needed to to keep track of the actual date someone came, as opposed to the date they said they will come. Let me explain with an example:

A mom register for attend a free class on Thursday February 1st. She can't come that day, but shows up next week on Friday February 8th. I want to update my records, but it is now Monday February 12th and the form does not allow me to update the date.

 I already figured dit out. Thanks!

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