You can specify +1’s for specific people by navigating to your attendee list and clicking the attendee name.
STEP BY STEP INSTRUCTIONS:
Step 1: Click on Attendee List
Step 2: Search for Attendee Name and click on View/Manage
Step 3: Edit Attendee
Step 4: Scroll down to “Number of guests this attendee may bring” and select a number
Step 5: To save, click: Update Attendee