If you're interested in attending, Rue La La brings you discounted VIP tickets for $45 (usually $70). You can get the discount here.
The tickets are valid for Friday October 28th ($25,000 high-jump competition for the Armed Forces Cup) or Saturday ($100,000 grand prix). Both days will feature the Equitation Classic Finals, as well as the Caisson Platoon exhibition and the Jack Russell terrier races.
Even if you choose not to attend the event, the Horse Show will be holding Kids' Day on Saturday from 10A-2P on F Street, which you can drop by at no cost:
WIHS Kids’ Day Will Host: