The band played a show in Harrisonburg on this date, so it's quite possible that this show is misdated. Harrisonburg is only an hour away, though, and since this is an opening gig, it's not impossible for Dave to have played both. The reference to Rodney King helps with dating this show as the L.A. riots took place from April 29 to May 1, 1992.
It's worth noting that the April 30 issue of the Charlottesville Observer Magazine advertised this show as happening on "Saturday, May 3," so it's possible that 5.3.92 is the correct date. The May 1 issue of the Staunton Daily News Leader, however, simply says that the show will be "this Saturday," which makes us think it likely happened on 5.2.92 after all.