Lighting, of course, can do a lot for a show, and Genesius Guild’s presentation of Much Ado About Nothing boasts a lovely, understated elegance – particularly in the twilight scenes – that’s much to the credit of designers Maaz Ahmed and Andy Shearouse. But at July 23’s Lincoln Park performance, it wouldn’t have been out of place for the duo’s mention in the program to come with an amendment: “... and special contributions by God Himself.” It turns out that lightning, too, can do a lot for a show.