National Deep Dish Pizza Day, marked annually on April 5, celebrates the day the first deep dish pizzeria opened outside of Chicago in 1979. Photo by caribb/Flickr
National Deep Dish Pizza Day is celebrated April 5, the date that Uno opened its first non-Chicago location in Boston in 1979.
Other holidays and observances for April 5 include National Caramel Day, National Flash Drive Day, First Contact Day (Star Trek), Bell Bottoms Day, National Dandelion Day and National Raisin and Spice Bar Day.
