Reply to Clarelady
Not sure what's going on. There are lots of wasps still about, a mixture of workers still foraging (rather late for them, perhaps the brood season has been extended by warm weather) and the new sexual generation of males and queens. Wasps are not particularly attracted to lights, but when the queens have mated, they look for hibernation quarters, often indoors, in lofts, in sheds etc. The males and new queens do not return to the old nest, so it is they you may have congregating after their party yesterday.