has the ground witnessed any important sporting moments?
Yes, Yorkshire beat the touring Australians by five wickets, after dismissing them for 23 in their second innings.
Headingley Cricket Ground
In 1902, Yorkshire beat the touring Australians by five wickets, after dismissing them for 23 in their second innings with George Herbert Hirst and Stanley Jackson taking five wickets each.

who is george macaulay? He was a professional English cricketer. which club did he play for? Yorkshire County Cricket Club. when did he play his first test match? 1923. against which team? South Africa. how was his performance during the series? "Wisden" reported that Macaulay was in excellent form for the whole of the 1923 season. when was the club formed? 8 January 1863. where do they play their home games? Headingley Cricket Ground. name a few players who have captained the club? Wilfred Rhodes. where is the above stadium located? Leeds, England.
wiki:10151871
Headingley Cricket Ground [SEP] Notable sporting moments
In 1902, Yorkshire beat the touring Australians by five wickets, after dismissing them for 23 in their second innings with George Herbert Hirst and Stanley Jackson taking five wickets each. Donald Bradman's innings of 334 in the 1930 Ashes Test included 309 runs on the first day, and he followed it in the Australians' next test at Headingley in 1934 with an innings of 304. Spinner Hedley Verity took 10 wickets for 10 runs in 1932 for Yorkshire v. Nottinghamshire, still the best bowling analysis ever in first-class cricket. Verity had also taken all ten against Warwickshire at Headingley in 1931.