It’s already September and the unofficial end of summer is almost here with the approach of Labor Day weekend. Since social gatherings are still banned in the city, several Austin restaurants are offering takeout and delivery holiday specials and meals for those backyard picnics and socially distanced park visits, from Salt & Time’s butcher burgers to Dai Due’s venison hot dogs to Easy Tiger’s apple pies to Le Cowboy’s lasagnas. Labor Day weekend takes place from Saturday, September 5 through Monday, September 7. When ordering, be sure to tip well and wear a mask when picking up or accepting delivery orders. Know of a Labor Day takeout special or food-/drink-related virtual event…