You can customize your card to include an additional RSVP question to allow your guests to state their meal preferences, how many children will be attending, or which events during a weekend-long event they'll attend. The character limit is 255 characters.
On the Enter Details page, in the "Event Page Settings" section, click on "See additional options".
Click “Add additional RSVP question for guests to answer".
Enter your question, and then save your changes.
When your guests reply “Will Attend,” this question will be shown automatically. If your guest skips answering the question, they can return to the card and the question will be displayed for them again. When you preview your card, you can submit an RSVP in order to see how the question will appear for your guests.
Unfortunately, the Flyer toolset is not able to ask guests an additional question at this time.