Circus is Monthly and usually falls on the last weekend of every month apart from Special partys like Easter Sundays with Villalobos and john Digweed headlining. Theres also Chibuku and Cream, creams on easter weekend the night before Circus, not sure of the lineup though. Then you have the smallers underground nights like MuMu and Freeze etc. Liverpools spot on for clubbing. But Like the other guy said Circus is the best for Big name djs
I went to Cocoon at Nation last year for Circus. Sven Vath, Loco Dice, Joris Voorn and Yousef. In my top 3 nights out of the year and that includes Ibiza. What a nice tidy club and the drinks weren't too ridiculous either. Think I paid £3 for a bottle of lager. Concert Square was more expensive.