#OTD (September 6) in 1980, took place the final gig of Stevie’s “Hotter Than July Music Picnic” at Wembley Arena and the unscheduled appearance of Motown superstars @dianaross and @officialmarvingayemusic was the extraordinary highlight. Diana was in the audience during a private visit to London, even as her “Upside Down” hit remained in the UK Top 20 after its #2 peak in August. Marvin was living in the city as a US tax exile, while also recording music there which was later to appear on his album, “In Our Lifetime”. For the 8,000-strong crowd, Marvin, Stevie and Diana together sang Marvin’s “What’s Going On” towards the concert’s end. By this time, Stevie had performed a two-and-a-half-hour set jammed with hits, including “Superstition,” “Living For The City,” “Boogie On Reggae Woman,” “Higher Ground” and “Sir Duke.” He also played two tracks from the upcoming Hotter Than July: “Master Blaster (Jammin’)” and “Happy Birthday,” and noted the significance of the latter in his campaign for a federal holiday to mark the birthday of the late Rev. Martin Luther King. The following night, Stevie played a charity fundraising concert in London in aid of Save The Children. #StevieWonderLegacy