Charlie's is a country/western-themed bar known for offering line dancing lessons and having an underwear night. There are also a few gay bars on the 'Fruit Loop' somewhat behind the MGM grand. If anything, you can say that you needed to get something at Albertson's, which is just across the street.
It's about a mile behind Bally's on Flamingo, the bus and taxis go there, and it's more of a bar than gay club.