If you receive RSVPs exceeding the number you estimated/paid for when buying a Shareable Link, additional RSVPs will be hidden. We'll let you know that you need to unlock more RSVPs and recommend a number.
If you have hidden RSVPs, you'll see an option on your Manage page to "Unlock RSVPs":
If you don't have enough coins in your account to cover the cost of purchasing more RSVPs, you can easily purchase any additional Coins here. You can estimate how many additional RSVPs you anticipate receiving and purchase whichever package makes most sense. If you have questions about unused RSVPs after your event, please contact us.
Please note - guests whose RSVPs are hidden won't see anything different on their invitation. They won't receive broadcast messages from you until you unlock more RSVPs, but they can still send you a message.