Its the Retail Clerks Family Fun Night at Disneyland, February 21, 1968. This is one of my favorite Flier's, I like how it's done in a "scroll" style and it lists some cool details on the "New" attractions at Disneyland.
Those Retail Clerks sure did have some fun parties, check out these previous posts for the Retail Clerks:
Space Mountain 1977 & TV Guide 1957
Retail Clerks Family Party - 1975