A few years ago the Underground gave their busiest stations for entrances, which overall were the likes of Kings Cross, and then the busiest after 10pm, which were a different set, Leicester Square and indeed Covent Garden among them.Doesn't Covent Gardens have signs saying its very busy on Friday nights and weekends or something like that
For weekends I'd have to offer South Kensington as well.
Something will ultimately have to be done about the various Underground pinchpoint stations - Camden Town, Covent Garden, South Ken, Clapham Common etc. Expensive, but their revenue must be very substantial as well.