The Events Check-In App displays the following information when adding events:
If you have more than 50 events, you must wait until some events pass and then sync your app again for the next set of events to be available.
The App allows up to five devices to log in per Username. If you log in to additional devices, users will be logged out and will lose their check-in data if they haven't synced.

Click the checkbox to the right of the student's name. This allows you to view/update the Number of Guests, Check-In for the selected Event, or Cancel the check-in and return to the Event Attendee list without saving the information in a pop-up window.

Note: Event staff members can uncheck an Attendee if they wish to remove the check-in. Once synchronization is complete, the check-in will be removed.
Navigate back to My Events page to choose another event if desired.
When a student registers for an event, you can include a QR code in the HTML version of the confirmation email. They can then scan this code when they check-in for the event to streamline the process and reduce manual work on your end. Events 5.0 introduced enhanced QR Code functionality.
Note: the QR code Check-In functionality and configuration process also works for the Staff and Volunteers associated with the Organization Event.
Example: https://targetx-eventsb.na14.visual.force.com/apex
<img alt="Image Missing" src="https://quickchart.io/qr?key=q-y4owo7q9quojmp34rgtdlotxlgycu181&text=https://<<Insert logged in URL prefix here>>/targetx_eventsb__QRcheckin?cid={!Contact.Id}" width="200" height="200" />
There are two options available when configuring QR codes for event check-in. Public QR codes can be created to allow attendees to check themselves in at events. Restricted QR codes can be created to allow only staff members to check in event attendees.
To build the public QR Code in your confirmation email:
<img alt="Image Missing" src="https://quickchart.io/qr?key=q-y4owo7q9quojmp34rgtdlotxlgycu181&text=https://<<SITEURLHERE>>/targetx_eventsb__QRcheckin?cid={!Contact.Id}" width="200" height="200" />
To construct the restricted QR Code in your confirmation email, please adhere to the detailed instructions provided for Building the Restricted QR code above. Once you have generated the QR code, carefully insert the code into the HTML Source code of your email. This ensures that the QR code is properly embedded and functional within the email, allowing recipients to easily scan and access the restricted content.
Ensure that you include the QR merge field in both the Event Confirmation email and the Event Off Waitlist emails.
Instructions for adding merge fields to email templates using the Old Email UI:
Example: Contact Fields - First Name - {!Contact.FirstName}
Depending on when this code is scanned, it will direct users to one of two pages:
Note: Users scanning a Restricted QR code during or outside the check-in window will be asked to sign in to Salesforce before being redirected to the appropriate page.
Permissions for scanning Restricted QR codes: On Active Users, edit their Profile and provide access to Read and Edit Contact, Contact Schedule Item, and Organization Events object permissions. They must also have access to the Visual Force Pages related to Events.
QR Code check-in is active during and for a configurable window before and after the event.
Note: These values will default to the number of hours set in the Custom Settings but can be edited.
In Events versions 5.0 and higher, additional QR code check-in functionality is available, including:
Want to include QR codes in your output file? Well, here's how to do it:
A QR Code "scan" button is available on the Event Details and Event Attendee pages, which, when clicked, opens a built-in QR Code Scanner:

When a user scans a student's QR Code, that student's record will be auto-located and present the Check-In pop-up.

As guests arrive at your event, you can mark those guests as Attended in one of two ways (the same check-in processes apply to those serving as Staff or Volunteers):
If you include QR codes in your confirmation email, you can easily scan these codes using a scanner or even a smartphone, and the guest’s status will automatically be updated to “attended.” QR Codes have a time window that they can be used before and after an event; these are configured in Events Custom Settings.
For instructions on generating QR codes in your email templates see Using QR Codes for Event Check In.
The other means of marking your event guests as attended is to have the event open on your computer at the event check-in desk. You can then use the Filter to find the specific guest, and click the “Attended” checkbox. As attendees arrive, you can use the filter section to search for them by first name or full name. Note: Use an * as the filter to bring back ALL registrants.

Note: if you are updating the number of Guests, you must click outside of the Guests Field or press the tab key on your keyboard for the auto-save to be triggered.
If an unregistered or uninvited guest wishes to attend your event, you can add him or her to the guest list by clicking the New Event Registration or New Invitation buttons.