E3 2017 will be open to the public, for the first time ever. Tickets are priced at $250, but there is an early bird discount for $150 that will be available on Monday when tickets go on sale. There will be 15,000 tickets available in total. They will provide access to the show floor, panel discussions, and other events from Tuesday through Thursday of E3 week. The ESA is also partnering with Geoff Keighley to provide access to special benefits associated with his E3 programming, developer interviews and whatnot.
Don’t confuse this with the “E4 All” event from a while back, E3 has always been closed to the general public.
E3 will run from June 13th to the 15th.