Fodor's Expert Review Underbelly Festival

Running from April to throughout the summer, Underbelly offers a packed calendar of stand-up comedy, cabaret, and circus from its pop-up location in Cavendish Square, just north of Oxford Street. The range of shows caters to all ages, from family-friendly daytime events to risqué after-hours parties. Shows take place in a self-contained, inflatable, cow-shaped venue (hence the name of the festival). Tickets can be purchased in advance or on the day. There's also a sister festival in Earl's Court.