Elvis and Priscilla pic. A date?

yep i would say Tom Jones show at Caeser Palace in LV May 1971

same here. Priscilla looks all dressed up for something and Elvis looks very similar to the pics with tom and merv.

yep i would say Tom Jones show at Caeser Palace in LV May 1971

As bripet56 already noted, it's more likely from one of Elvis' engagements, either Tahoe (7-71) or Vegas (8/9-71).