Happy first day of spring. (Hear that, weather?)

KONNICHIWA
Pop-Up Sake Bar
What: Switch up your happy hour routine with a dose of the Japanese rice wine. Choose from more than 90 varieties made by craft brewers from across 24 prefectures.
Why: Up to this point, your knowledge of sake includes shooting while downing all-you-can-eat sushi. Learn more from sommeliers and sake samurai (yes, samurai).
When: Tonight, 4-7 p.m.
Where: Vanderbilt Hall, Grand Central Terminal, 87 E. 42nd St., b/t Park & Lexington Aves. Tickets ($25) at eventbrite.com.

SCORE
Housing Works Best of Spring Sale
What: The do-gooder thrift shop culls its enormous stock for the top looks of the season and marks them even lower than the regular steal-level prices.
Why: Should you find yourself glued to the couch, click around the site for finds from Lulu Guinness, Ports 1961, and more.
When: In-store, thru Mar. 30; online, thru Mar. 25.
Where: Locations at housingworks.org.

LAUGH
NYC Improv Festival
What: Get your week’s worth of chuckles from a marathon of performances, courtesy of The People’s Improv Theater. Pay show by show or splurge for the $40 all-you-can-watch pass.
Why: The Scene (Thurs., 9:30 p.m.) for its always-stellar special guests, The Baldwins (Sat., 8 p.m.) for some of the best NYC har hars, and Chicago’s The Grr and ImprovBoston (Sat., 6 p.m.) for out-of-town hysterics.
When: Thru Sat.
Where: Locations, schedule, and tickets at nycimprovfest.com.

SAVE
Lela Rose Wedding Sample Sale
What: Say yes to up to 75 percent off the designer’s gowns, including a strapless organza number with cascade skirt ($1,295, reg. $3,595) and a V-neck dress with lace trim ($1,895, reg. $4,995).
Why: One more bridal magazine and your head will explode.
When: Today, 8 a.m.-7 p.m.; Fri., 9 a.m.-6 p.m.
Where: 224 W. 30th St., b/t Seventh & Eighth Aves., 14th flr.

RAVE
Girls & Boys
What: Let loose to the tunes of Breakbot, Kill Paris, Irfane, and Alex English.
Why: Those glow sticks have gathered dust in your drawer long enough.
When: Fri., 10 p.m.
Where: Webster Hall, 125 E. 11th St., b/t Third & Fourth Aves. Tickets ($30) at ticketweb.com.

Photo: Benjamin Torode / Getty Images