My sister saw ESB at a drive-in in Las Vegas in 1980 (I didn't go) but I doubt if it exists anymore, as so many drive-ins are gone. I didn't see SW or ESB until '82 in Florida, but I have no idea what the theaters were called or if they still exist. Same for ROTJ in '83.

This is where I saw many movies as a child. I didn't see SW there in '77 but it played there (see the 9th comment from the top):

http://cinematreasures.org/theaters/3183

The 2 b&w photos they show are actually interior shots, the lighted marquee being at the entrance of one of the screening rooms (pretty sure I saw The Muppet Movie in that very screening room in '79). That part of the theater was designed to look like an exterior street scene, complete with real shops and lampposts. It was quite a place. I understand it was demolished in 2002. Bummer. I remember it being a huge place, and apparently, it was one of the largest movie theaters at the time, having an impressive 11 screening rooms in 1973:

http://cinematreasures.org/theaters/3183/photos