If you look at a calendar you won’t see it. If you search through holiday records, you won’t find it. What could it be? Although this is not an official riddle, the question’s answer matches a few unofficial holidays that are quite popular in the United States. One of the most important of these is 8/11 Day. What is 8/11 Day? It represents the day of August 11, and it’s basically the day when we celebrate the importance of calling 811 utility locate Denver infrastructure compliance professionals before digging in our backyards (or any community building’s yard for that matter).. Even though it’s not known by too many people, 8/11 day has really caught on in recent years, and it has become one of the most fun and engaging holidays in August. This year, 8/11 Day falls on a Saturday, so you can be sure that a lot of people are going to want to celebrate it, since Saturday is not a work day for most. Block parties at multifamily buildings and barbecues hosted at various houses, with an invitation for most of the neighbors in the area, are among the top most popular ways to celebrate 8/11 Day throughout America. Even though you might only have moved to your neighborhood, you’ll find that 8/11 Day can be one of the best times of the year to get to know your neighbors and form new bonds and friendships.