Here's some of the events that were outside SDCC which features the Adult Swim on the Green, The Tick, Netflix, FXX, Fox, Blade Runner 2049, AMC Deadquarters, Mr. Mercedes, Syfy, Teen Titans, LEGO Ninjago, King Kong Skull Island and the Petco Interactive Zone. There are tons more events but these were what we saw. Lines for most of these were long with even longer lines during the weekend. Since most of the outside events are open to everyone including those without a SDCC badge you can expect to wait in lines for hours at all the outside events unless certain outside events require a reservation online prior to SDCC.
Pictures below show you some of the outside events.