It takes a lot to keep people away from the War Memorial Opera House, whose audiences have been known to brave torrential San Francisco weather just to see a show. Unfortunately, the pandemic wouldn’t disappear as easily as thundering clouds. The San Francisco Ballet had just opened its production of the George Balanchine-choreographed “A Midsummer Night’s Dream” when lockdown orders went into effect in March 2020. Since then, the only way to experience the company’s work was to stream productions (archival shows and new short films) through its official site. After a year-and-a-half of digital dance, the Ballet is ready to perform in person again. Before the company returns to the War Memorial, it’ll head down to Stanford University — the first time the company has visited in half-a-century — to perform the appropriately named “Starry Nights: S.F. Ballet’s Return to the Stage.”