Music

Night Watch

Paddy Fest Boston @ Underbar

Paddy Fest Boston

Saturday, 10:30 p.m., Underbar, 275 Tremont St., Boston. 21+. Tickets: $20. 617-292-0080, www.underbaronline.com.

The deal: After a day of pubs and parades, the party doesn’t end at Boston’s only annual bar crawl after-hours event. Get there early to beat the crowd and enjoy the fun, the full bar, and the music until 2 a.m. With the vocal house beats in the main room and Top 40 pop in the spacious side lounge, the night is sure to attract a diverse crowd of St. Patrick’s Day fanatics, says club marketing director Christophe Muller. Snag a ticket online for up to 50 percent off the regular price.

The DJs: Special guests DJ Adilson and DJ Chris P.

Who goes: Expect to see a range of holiday partygoers, says Muller, describing the usual scene as ages 25 to 35. “It is a very mixed crowd, especially with the different rooms and different types of music.”

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What to wear: The “casual chic” dress code prohibits all athletic wear and sneakers, so elevate your St. Patrick’s Day best with some classy green glitz.

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The tip: Muller suggests attendees take it easy during the day’s pub crawl if they want to get in. “Do not come drunk, there will be no access for you.”

Katy Rushlau

Katy Rushlau can be reached at katherine.rushlau@globe.com