Schilde (Antwerp, Belgium), 2006. The 'Boriss Spassky schaakclub' was named after Boris Spassky (who would have thought that) and he is the godfather of that club. The club was created in 1956, the year after Boris Spassky became world youth champion in Antwerp (1955, his first trip outside the Soviet Union). That tournament was led by Hendrik Baelen who asked Boris one year later (1956) if he would agree to become godfather. In 2006 the club celebrated it's 50th anniversary, and part of the festivities included a (rather relaxed) simul between Boris Spassky and some 20 club members (not just from our club but from other Antwerp based clubs as well).
I knew Spassky would play KG if you responded with 1. ... e5, which was my preferred response to 1.e4 at the time, but I needed to avoid that by all means (he is a world expert on KG), so I went for the Sicilian, hoping for a 'closed' Sicilian (was also part of his vast repertoire). But he responded with an open Sicilian and to my accelerated dragon he went on with a Maroczy bind setup.
I struggled a bit in the middle game (no real blunders, I think, but a few too passive moves) and White clearly has some advantage near the end, but there is no obvious clear winning plan, at least not one that he saw during the game, so we agreed on a draw (if it were important, he would certainly have played on). In the aftergame analysis he agreed that if white opened the game, black's kingside pawns (and still at least also the b-pawns on the queenside) in combination with the bishop vs. knight could become a weapon for black with counter chances.
Shortly after that game, I quit OTB chess for good, so it is not only one of my best memories, but also one of the last.