Setting a specific date for the next send in a journey.

I feel like I am missing something very basic, but I am setting up a simple campaign.  People register for a series of events, and on date X, Y and Z, I want to send them a reminder for the next event.
I have a journey set up and the trigger is the form fill.
I am looking through all the ‘wait’ options, and there are not options for ‘wait until date X’.
I queries the ‘Ask AI’ and the only solution it returned was a convoluted option for coding in some javascript values into the upstream form submit.  This seems way more complicated.  Is there really no simple option to say “On date X email all people in the campaign?”