Never found any soul nights as such when we were there just happenned to see 'Billy Wade' at the Luxor one year. You can pick up a visitors guide in some of the hotels and they will list the entertaiment lounge acts etc.
Jersy boys is on there which is the story of Frankie Valli and the Four Seasons. If you like their songs you might enjoy that. Just been to see the one in London. Some clips on Youtube.