RSVPify allows you to schedule a date and open your registration/RSVP form at a later time. You can do this from the actions menu of your event's header navigation:
Step 1: Locate 'Schedule to open' option
In your event's header navigation, locate the Actions menu and from there select the 'Schedule to open' option.
Step 2: Set registration open date and time and customize the message your guests will see until the time in which your registration period opens.
Step 3: Publish & Schedule Open
Your event link will become publicly accessible but your registration form will be closed.
You can change the registration open date & time by clicking on the Edit button in the actions menu dropdown: