There are many climate action events surrounding the United Nations General Assembly.

Event about events: Everything you need to know to navigate Climate Week NYC. September 23rd – 29th
Tue, September 17, 2019 5:30 PM – 8:00 PM EDT
The NY Society for Ethical Culture 2 West 64th Street New York, NY 10023
https://www.eventbrite.com/e/everything-you-need-to-know-about-climate-week-nyc-tickets-72254245393

Significant Events.

UN Asia Pacific Climate Week 2-6 Sep Bangkok Thailand was a lead up to UN Climate Action Summit 2019 23 Sept NYC and COP25
https://www.regionalclimateweeks.org/

Farm Aid 2019  September 21,  Alpine Valley Music Theatre in East Troy, Wisconsin
https://www.farmaid.org/festival/about-the-festival/

Worldwide strike events: Global Climate Strike 20-27 Sept
https://globalclimatestrike.net/

NYC Climate Strike! Join Greta Thunberg Friday, Sept. 20  12:00 PM-5pm
https://strikewithus.org/nyc/
Foley Square – One Federal Plaza NYC
12:00 PM – Assemble at Foley Square
1:00 PM – March to Battery Park
2:30 – 5:00 PM – Rally at Battery Park
RSVP https://actionnetwork.org/events/new-york-city-climate-strike-with-greta-thunberg

UN Climate Action Summit 2019 23 Sept NYC
https://www.un.org/en/climatechange/un-climate-summit-2019.shtml

UN Global Goals Week Sept 21-30 listings
https://globalgoalsweek.org
https://globalgoalsweek.org/schedule/events-2019/

Walk the Talk New York — The Health for All Challenge Sept 22 Central Park 102nd St. Transverse New York, NY
Start Time: 7:00 Am | Opening Ceremony: 8:30 Am | Walk/Run 9:00 AM | Closing Ceremony 10:45 AM
https://nycruns.com/races/?race=walk-the-talk-new-york

Climate Week NYC September 23 – 29
https://www.climateweeknyc.org/

UNFCCC COP25 2-13 Dec, Santiago Chile
https://unfccc.int/Santiago
https://www.cop25.cl/en/

Some Selected Other Events

#ClimateReboot Hackathon
Thu, Sep 19 & Sep 20th – Fri, Sep 20
SAP America, Inc., 10 Hudson Yards New York, NY

Now or Never: Storytellers Tackling Climate Change
Thu, September 19, 2019 6:00 PM – 8:30 PM EDT
Subculture 45 Bleecker Street New York, NY 10012
Co-sponsored by the Natural Resources Defense Council (NRDC) and Guernica magazine
https://www.eventbrite.com/e/now-or-never-storytellers-tackling-climate-change-tickets-65424569649

Our Future Festival NYC: A Day of Climate Action, Ideas, and Inspiration
September 21 11:00 AM – 5:00 PM EDT
Nolan Park Governors Island New York, NY 10004
The Climate Reality Project NYC Metro Chapter; Human Impacts Institute; The Trust For Governors Island
https://www.eventbrite.com/e/our-future-festival-nyc-a-day-of-climate-action-ideas-and-inspiration-tickets-68729815729

Sunken City: a NYC Climate Change Escape Room by Human Impacts Institute
22 September 2019 11:00 AM – 5:00 PM EDT
House of Solutions Nolan Park House 4B Governors Island NY, NY 10004
https://www.eventbrite.com/e/sunken-city-a-nyc-climate-change-escape-room-tickets-68627275027

2040 Film Screening
22 September Sun, 5:30 – 8:00 PM
Regal Cinemas, 263 W 42nd St New York, NY

Falter: Conversation with Bill McKibben Thursday, September 26
New York Botanical  Gardens  2900 Southern Blvd Bronx, NY

“Choose Us” – Youth Climate Strike Demands Solutions and Action Now! Monday, Sep 23, 7:30 – 9:00 PM
New York Society for Ethical Culture 2 W 64th St, New York, NY
https://ethical.nyc/event/chooseus-climatestrike/
https://www.eventbrite.com/e/choose-us-youth-climate-strike-demands-solutions-and-action-now-tickets-71420876765
Join us for a conversation with youth climate leaders, moderated by former Vice President and Climate Reality Project founder Al Gore, to learn how to move their demands forward with the urgency required by the global climate crisis. Sponsored by Blue Planet Alliance and presented in partnership with 350NYC, The Climate Reality Project, Drawdown NYC, and Pachamama Alliance. Participating groups include Fridays for Future, Earth Uprising, Earth Guardians, Sunrise Movement, Zero Hour, Extinction Rebellion Youth US, and more. For more information about the Climate Strike, visit strikewithus.org.

Climate Change, Water & Climate Change, Water & National Security for Jordan, Palestine, and Israel
by The Sabin Center for Climate Change Law, Columbia Law School  Tue, September 24, 2019
7:00 PM – 8:30 PM EDT Columbia Law School 435 West 116th Street Room 103 New York, NY 10027
https://www.eventbrite.com/e/climate-change-water-national-security-for-jordan-palestine-and-israel-tickets-66215027931

Virtual Cinema: Program One Nicholas de Pencier, Jennifer Baichwal, Edward Burtynsky Oct 10, 5:30 PM,  Oct 12,  9 PM & Oct 13, 5 PM  as part of Convergence: The eighth edition of the annual program delves into innovative modes of storytelling via interactive experiences, featuring Virtual Reality, Immersive Cinema, gameplay, and more. 57th New York Film Festival, Amphitheater Lincoln Center NY.
https://www.filmlinc.org/nyff2019/films/virtual-cinema-program-one/

More Event Listings

Event listing from Google

Many events are on Eventbrite

Columbia’s Earth Institute event listing.