: You can visit the Barclays Center Box Office in person during regular hours. Buying here often allows you to avoid Ticketmaster fees , though they do not sell resale tickets and may not sell tickets on the first day a major event goes public.
If your query was actually about the (the notoriously difficult ultramarathon), there is a legendary "essay" required for entry:
How to Get In to the Barkley Marathons - Random Forest Runner
: Check official artist websites or use American Express Cards for early access to select events. The "Barkley" Connection: The Entry Essay
: Successful essays often balance humor with a display of the grit needed to survive the race. It should generally be kept to a single page.
Which of these were you looking for more detail on—the or the ultramarathon ?