My mom's English and my dad's from the Bronx... deviled eggs just didn't happen at our house. 
It wasn't until I moved here to E TN, that I found out they were at almost everything "special"...same with ham biscuits, no matter what time of year, or what meal. Here people serve them at cocktail parties, both biscuits and deviled eggs!! I got into making them a lot because I took them to a big tailgate one year, and from then on I always had to make deviled eggs and sweets, that I had already been committed to. That's how I got into doing them in the food processor.....turning 3 to 4 dozen eggs into deviled eggs the morning of a tailgate is terribly time consuming, and I'm so anal about my cooking they always had to be done that morning and look perfect. I would always boil extras, so that if they didn't peel right, I had extras.
Growing up in the midwest, deviled eggs were at picnics, or church potluck suppers in the summer. My mom occasionally would do them with leftover Easter eggs, but usually it was egg salad for school lunch. We always had them July 4th and Memorial Day at my step-grandmothers.