The "Find my invitation" block will be visible if you have added any invitees to your invite list.

The purpose of this block is to let the event registration system know who is replying, and track who has replied from your entire event invite list.
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​As a note, if you are sending email invitations, the block to find an invitation can be automatically skipped, as the system already knows who is registering for an event when they click from your email.

This means that, if you include the 'Attending/Not Attending' button in the body of your email invitations and an invitee clicks on that button, they will immediately be taken to the primary/registration block of your event without being asked to find the invitation.

You can choose to delete your invite list, and the block will no longer show...

You can also change the verbiage 'find my invitation' to something different - some examples would be:

To do this, go to event settings > languages & translations. Then click on the button for customizations.
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Then locate the 'find my invitation' field to edit the verbiage:

Matching invitees with the invite list

The invite list includes several settings that you can change to set up the type of invitee lookup that fits your event best (ie. by name only, by email, or by both). You can learn here how the invite list matches your invitees?

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