probably it was "just Friday" but for muslims Friday is a "mini-celebration day" & it even has a pray with it's name "Friday" that's the 2nd of 5 of that day & can only be made in a relatively large group & that it's better than praying alone- hence they were running not to miss the group "not because they aren't allowed to miss it but to the previously mentioned believes", so probably you will see the same scene each Friday afternoon in places with a relatively large muslim population
RE: Picture a Day - Evening Prayer