The theatre marquees will go dark for one minute on 8 December to mark the death of the Tony-winning author of Dancing at LughnasaBroadway theatres will dim their lights next month in memory of Brian Friel. The Irish playwright's early drama Philadelphia, Here I Come! was first staged on the Great White Way almost 50 years ago, and he won a Tony award in 1992 for Dancing at Lughnasa. He died on 2 October, aged 86.The…