Henry Longhurst, who played many Hewitts for Charterhouse, generally as the partner of John Morrison (yes that John Morrison, Colt's partner) has a bunch of stories about the event in his books. I will share but one... read 'My Life and Soft Times' (which you should anyway) for some more....
"I am assured, and can only hope it is true, that a small group of people, including John Beck (later to become the only winning British Walker Cup captain) and Sir Harold Gillies, 'the well-known plastic surgeon', were discussing at lunch at Addington the desirability of founding an annual competition for teams of public school old boys, and that, the details having been agreed, somebody, almost certainly Beck, said, 'Now all we need is some bloody fool to present a cup.' At this moment Halford Hewitt walked in, to find himself almost at once to be immortalized as the founder of the best-loved tournament in golf."