Dependent date selections

I have a Google spreadsheet that contains a list of events displayed in a 5-week calendar format.

These are 2-day events however the first and second day are roughly two weeks apart.

A user selects their preferred first and second dates within the following framework:

1. The first date must be within weeks 1-3.
2. The second date must be within the week number that is two weeks after the first date. For example, in f:s, where f is the week containing the first date, and s is the week in which the second week must be selected:
   • Week 1:Week 3
   • Week 2:Week 4
   • Week 3:Week 5

Is there a way in Google Sheets to limit the choice of the second week based on the first week selected?