How time passes! (It’s the quadricentennial of Henry Hudson’s arrival.)

RIDE ON
First Manhattan Bike Jumble
What: Beater bikes, racing gear, cruiser accessories, cycling luggage cases, and other items to convert you to two wheels.
Why: There is a season, turn, turn, turn.
When: Sun., 10 a.m.-4 p.m.
Where: Schoolyard at E. 4th St., b/t Aves. B & C.

OBSESS OVER
Fashion Week Dossier
What: Indie fashion’s underbelly exposed! Intimate interviews, gallery-hopping itineraries, drunken after-party photos, soundtracks, runway pics, and all the newsy bits (pop-ups, installations, limited-edition merch) you crave.
Why: You can’t say no to Swindles.
When: Updated throughout the day, now thru Sept. 18.
Where: Online at dailycandy.com/dossier.

TIME TRAVEL
NY400
What: Rejoice in 400 years of Netherlander camaraderie by touring 17th-century New Amsterdam housing at Bowling Green Park, boarding replica ships from the 1600s docked on Manhattan’s southern tip, and attending a Harbor Day celebration to get you back on shore.
Why: Speed dating sessions with Dutch people. (Random!) Be a pioneer.
When: Thurs.-Sun. Various times.
Where: See events schedule.

EAT UP
A Voce Columbus Opens
What: Classy spin-off of downtown’s refined, modern Italian resto. Pretheater prix fixe and weekend brunch to come.
Why: Chef Missy Robbins (an Obama family favorite) in the kitchen.
When: Sun.-Wed., 5-10 p.m.; Thurs.-Sat., 5-11:30 p.m.
Where: Time Warner Center, 10 Columbus Cir., b/t 58th & 59th Sts., 3rd flr. (212-823-2523).

SPIN SOME
Superstar DJ Record Fair + Vintage Fashion Bazaar
What: Music nerds (journalists, business types, and other self-proclaimed DJs) unite from as far as DFA and as close as Etherea to sell really good vinyl and talk shop.
Why: Added bonus of fashion vendors like Vintageloftnyc, Jellyroll Vintage, Treasures & Pleasures, and I Heart (back from the dead for the weekend).
When: Sun., 11 a.m.-6 p.m.
Where: The Archway under the Manhattan Bridge, 167 Water St., at Pearl St., Triangle Plaza, Dumbo.