Founded in 2014, Sadler’s Wells’ Elixir festival is a season of performances, workshops, classes and talks that celebrates the older dancer – this year running on a smaller-scale, called Elixir Extracts. Opening its first evening was Liz Aggiss, dubbed the “enfant terrible of the bus pass generation” in the programme note, whose inimitable presence – equal parts Weimar cabaret host, dada dancer, rogue feminist and end-of-pier prankster – feels as fresh now as it did when she started out four decades ago.