Local ubergeek Burt Lum's monthly "Bytemarks" geek lunch has been scheduled for 11:30 a.m. on Thursday, Aug. 28, at Don Quijote (a.k.a. Holiday Mart) on Kaheka Street near Ala Moana Center. The "Bytemarks" lunch used to be held in downtown Honolulu. But now that Burt's day job has moved him