If you are getting the error message "This ticket is not for an ongoing event" when trying to scan a badge for an event in Odoo, it is likely that there is an issue with the event configuration or the ticket settings.

To resolve this issue, you will need to check the event configuration and make sure that the event dates and times are correct, and that the event is set to be ongoing at the time when you are trying to scan the badge. To do this, go to the "Events" menu and select the "Events" option. Then, click on the event you are trying to scan the badge for and go to the "Dates" tab in the event form. In the "Date and Time" section, check the event start and end dates and times, and ensure they are correct.

Next, you will need to check the ticket settings for the event and make sure that the tickets are configured to be valid for the event dates and times. To do this, go to the "Events" menu and select the "Tickets" option. Then, click on the event you are trying to scan the badge for and go to the "Tickets" tab in the event form. In the "Ticket Sale Start and End" section, check the ticket sale start and end dates and times, and ensure they are correct.

If you have checked the event configuration and ticket settings, and the issue persists, you may need to check the Odoo logs for more information about the error and contact the Odoo support team for assistance.