If you have set up a follow up form in a season you can then specify which sessions you want that form to apply to.  Use this article, Setting up a Follow-up or Supplemental Form , for instructions on setting up a follow-up form.

To assign a follow form to specific sessions:
  1. Select Setup under season name
  2. Select Registration Forms
  3. Select Edit next to supplemental form
  4. Select Participants in Select Sessions from Collect information from question
  5. Select Edit
  6. Check desired sessions
  7. Save
  8. Select Save & Continue