P&O doesn't go in for the huge West End-style productions the big US ships have popularised. Instead, expect British comedy; revue-type shows where the emphasis is on the singing talents of the performer rather than what's going on behind her; and magicians, ventriloquists and tribute acts.
There are two main shows nightly in the Arena Theatre (Decks 6 & 7) forward, (times vary; either 7:00 p.m. and 8:30 p.m.; or 8:30 p.m. and 10:30 p.m., to accommodate the two set dining times.
Ventura's in-house performance group Headliners Theatre Company, put on various singing and dancing revue shows throughout the cruise in the Arena Theatre, and also individual performers from the group were showcased at different spots around the ship. On our cruise the main theatre hosted a genuine star -- Jimmy James, a soul legend (not a tribute act) -- as well as Gareth Oliver, a Britain's Got Talent finalist, who entertained with his ventriloquism and comedy on two separate evenings (in typical British fashion, the daily Horizon magazine stated: "Tonight Gareth returns with a brand new show, completely different to his previous performance -- this time it's funny!")
Elsewhere on the ship, the two main venues for live entertainment are The Tamarind Club, which is a walk-through venue on Deck 7; and Havana, right at the back of the ship. In both these venues you'll find singers or bands on at various times throughout the evening. There is also a guest band depending where the ship is based, which will entertain during the day and at sailaways on the Pool Deck. Havana is also the nightclub, with a DJ and dancing till late.
There are a number of bars and lounges. The Metropolis Bar, on Deck 18 aft, is the classiest, reminiscent of a city centre five-star hotel bar. Each evening a plasma screen showed photos of a different city -- such as New York or London -- with a new city each night over a seven-day period. It's a place to sip a martini and gaze at the night sky.
The 'pub', called The Exchange, is on Deck 6 forward. It offers a wide selection of beers on tap and in bottles, as well as sporting events on wide screens and the inevitable karaoke evenings. The ship's casino Fortunes is adjacent and houses the usual game tables and slot machines. Check out its bar -- model trains (look for the Royal Scot and the Flying Scotsman, among others) run around it.
The Red Bar is, as the name suggests, red, and is an attractive drinking hole at the top of the three-story atrium and has a pianist every evening.
There are a number of outside bars, the two most popular are Breakers Bar, on Deck 16 overlooking the pool; and Laguna, on the Pool Deck, where some people sit and drink all day. They are both very noisy and crowded, with continuous booming music. If you want something quieter, head to the adjacent Beachcomber Bar, beside the part-indoor (there is a retractable roof) Beachcomber Pool. If you want something even quieter head to the Terrace Bar, above the Terrace Pool right at the aft of the ship (you have to walk through Waterside to get there.)