I hate doing roundups because I’m always afraid I will leave something out, so comment below when you think of something I didn’t. Here’s what I know:

WASHINGTON MARKET PARK
Pumpkin Carving Contest
Saturday, Oct. 26, 4:45 till 6
Bring your carved pumpkin to the park to compete for scariest, cutest, funniest, most realistic and most creative.

Annual Halloween Parade & Party
Sunday, Oct. 27, 1 to 3p
The parade will kick off at 1p from Citibank’s plaza on Greenwich and N. Moore led by the Lesbian & Gay Big Apple Corps Band
Then, in the park till 3p there will be crafts from the Craft Studio, parkour coaching from the Movement Creative, juggling and hula-hooping, children stilt-walking and performing from Children’s Tumbling, carnival games and all the other fun things the Friends of Washington Market Park cook up in every corner of the park.
Plan to park your stroller outside the park.

GOVERNORS ISLAND
Governors Island’s historic district will transform during the last two weekends of October with Pumpkin Point, a free, family-friendly patch of over 5,000 pumpkins opening October 19 in historic Nolan Park. Lighting up Colonels Row evenings October 17-20 and October 24-27, Night of 1,000 Jack O’Lanterns will feature over a thousand hand-carved and illuminated jack o’lanterns. And on Saturday afternoon, October 26, young visitors and their families are invited to come in costume for free Trick or Treating at Nolan Park’s historic former officers’ homes. Pumpkin Point will be open October 19-20 and October 26-27, 10 AM-6 PM. Pumpkins will also be available for purchase Thursday, October 24 and Friday, October 25, 10 AM-5 PM.

BROOKFIELD PLACE
Saturday, Oct. 26, noon to 3
Brookfield will host its annual Halloween bash with Cosmic Disco Aliens, a dance off, drag queen’s story hour, magic shows, science experiments and trick-or-treating around the mall.

SEAPORT
The Seaport has a few events set up — a pumpkin display on Pier 17, a dog costume contest and trick or treating on the 31st. See the details here.