 These shootings, on the day which became known as Bloody Sunday, were a reprisal for the killing of 15 people associated with the Cairo Gang, a group of British Intelligence officers, by Michael Collins' 'squad' earlier that day.In 1924, American rodeo promoter, Tex Austin, staged the Dublin Rodeo, Ireland's first professional rodeo at Croke Park Stadium.For seven days, with two shows each day from August 18 to August 24, sell out crowds saw cowboys and cowgirls from Canada, the United States, Mexico, Argentina and Australia compete for rodeo championship titles.