The Invictus Games are an international competition for wounded, ill or injured military members and veterans. Modeled after the U.S. Warrior Games, they were founded by Prince Harry. The inaugural Invictus Games were in 2014 in London. This year's games are expected to draw 500 athletes from 14 nations.
Tickets generally run about $13.00 per event and many are still available:
http://www.ticketmaster.com/Invictus...dp_Artist_Name