COVENT GARDEN has staged alt sorts of showsiu i.s time, and now th ' dance seasons have become a feature of the Covent Garden year. The great dance floor runs sheer from the boxes, over the buried stalls, to the back of the stage, and one can realise the enormous size of that stage when one dances up it, and finds it seems as deep as the front of the house. They are very jolly occasions, these popular dance nights, and the crowd enjoys itself more obviously, if not more sincerely, than the opera crowds do. One of the prime reasons for their enjoyment is, of course, Herman Darew ski's exhilarating band, which listeners will hear for themselves in the broadcast to-night.