28 from 18 nations competed in Equestrianat the Games of the XXXI Olympiad . The no. of events in sport was 3 . 1884; 135 years ago (1884) is when Equestrianat the Games of the XXXI Olympiad was founded  . The venue for Equestrianat the Games of the XXXI Olympiad was Olympic Indoor Hall (artistic and trampoline) . The official site of Equestrianat the Games of the XXXI Olympiad is chicagomarathon.com . 18 – 30 September 1988 was when it was held
28 contenders from 18 nations