The event promoter determines whether an interactive seatmap (ISM) is offered on the event.
When it is available it will be present on the event on the Ticketmaster.ie website. Fans can then see a seating map and click on the specific seats they require ahead of purchasing tickets for the event.
If no ISM is available, you can instead select either "best available" and the system will automatically pick the best seats for you out of the ones currently available or if preferred you can view available tickets via a specific section or price category.