It is possible to make changes to the registration form, even after you have sent out the invitation. The changes will be visible as soon as you make them. If you have received notifications before you have made the changes, it may be a good idea to send out a message to the participants who have already responded and ask them to review their notification. Follow the instructions here to see how to send a message to the participants.
The thing to keep in mind if you are sending a message in connection with changes to the registration form is that you only need to send to those who have already responded. The rest will see the latest update upon possible registration.
It is also a good idea to include a direct link to the registration in the message. To do so, select in the message box to Include buttons with links and Show: <To the registration page> as shown in the picture below. After the message, participants can then click on a button that takes them directly to their personal registration.
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