September 7, 2026 is a U.S. Federal holiday, Labor Day.  Government offices will be closed. According to the Department of Labor: “Observed the first Monday in September, Labor Day is an annual celebration of the social and economic achievements of American workers. The holiday is rooted in the late nineteenth century, when labor activists pushed for …

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The Air and Space Forces Association's (AFA's) 2026 Air, Space & Cyber Conference will take place at the Gaylord National Resort and Convention Center in National Harbor, MD from September 14-16, 2026. A virtual option is available. More information is on the event's website, which says (as of May 9, 2026):  

The 2026 Advanced Maui Optical and Surveillance (AMOS) Technologies Conference will take place September 15-18, 2026 on Maui, Hawaii. A virtual option is available. More information is on the event's website, which says: The AMOS (Advanced Maui Optical and Space Surveillance Technologies) Conference is the premier technical conference in the nation devoted to space situational …

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The 2026 International Observe the Moon Night will take place globally on September 19, 2026. More information is on NASA’s Observe the Moon website.

The 2026 Texas Space Summit will take place at the Henry B. Gonzalez Convention Center in San Antonio, TX from September 21-23. 2026. More information is on the event's website, which says:

SpaceCHI, "the world's first conference dedicated to advancing human-computer interaction in space exploration," will take place September 24-25, 2026 at NASA's Ames Conference Center Building 3, 500 Severyns Ave., Moffett Field, CA (near Mountain View). More information is on the event's website.

World Space Week takes place every year from October 4-10 to mark the beginning of the Space Age on October 4, 1957 with the launch of Sputnik by the Soviet Union and the entry into force of the U.N. Outer Space Treaty on October 10, 1967. Events take place globally and World Space Week has …

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The 2026 International Astronautical Congress (IAC) will take place in Antalya, Türkiye from October 5-9, 2026. More information is on the IAC website.

October 12, 2026 is a U.S. Federal holiday. The Office of Personnel Management refers to this as Columbus Day, honoring Christopher Columbus who is often cited as discovering the New World of the Americas in 1492. Beginning in 2021, others began referring to this as Indigenous Peoples’ Day honoring the indigenous peoples — Native Americans …

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UP/LINK: The SpaceTech Business Summit will take place in New York City from October 20-21, 2026. More information is on the event's website, which says: A November 18, 2025 email adds:  

The National Security Space Association (NSSA) will hold its 2026 International Security Space Forum at Boeing's offices in Arlington, VA from October 20-21, 2026. More information is on the event's website.

The 58th meeting of the American Astronomical Society's Division for Planetary Sciences (DPS) will take place October 25-30, 2026 in Spokane, Washington. More information is on the event's website.

Daylight Saving Time will end in the United States on November 1, 2026. Arizona and Hawaii do not observe Daylight Saving Time. For all other states, the clocks will “fall back” one hour at 2:00 am.

The Secure World Foundation (SWF) will hold the 8th Summit for Space Sustainability from November 4-5, 2026 in Brasilia, Brazil in cooperation with Brazil's space agency, Agência Espacial Brasileira (AEB). SWF is excited to announce that the 8th Summit for Space Sustainability will be held Nov 4–5, 2026 in Brasília, Brazil, at the National Museum …

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November 11, 2026 is a U.S. Federal holiday. Government offices will be closed. Veterans Day honors all who served in the military, whether they served in peace or wartime or died in battle. By comparison, Memorial Day, celebrated on the last Monday of May, honors those who died in battle or from injuries suffered during …

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The Global Network on Sustainability in Space (GNOSIS) will hold its 2026 conference, GNOSIS26, virtually from November 24-25, 2026. A "Save the Date" email sent in November 2025 says:

November 26, 2026 is a U.S. Federal holiday, Thanksgiving Day. Thanksgiving Day is celebrated in the United States on the fourth Thursday of November to give thanks for all that we have. The tradition dates back to the early settlers, but it was President Lincoln in 1863 who “encouraged Americans to recognize the last Thursday of …

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The second Habitable Worlds Observatory conference will take place November 30-December 4, 2026. As of April 18, 2026, the website does not specify the venue, saying only that it is "very close to Paris, France." Check the event's website for up to date information.  

The Interstellar Research Group (IRG) and the International Academy of Astronautics (IAA) will hold the 2nd European Interstellar Symposium from December 2-4, 2026 in Venice, Italy. More information is on the event's website, which says: The Interstellar Research Group is pleased to announce that December 2-4, 2026 the 2nd European Interstellar Symposium will be held in Venice, Italy. …

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December 25, 2026 is a U.S. Federal holiday in observance of Christmas.  Government offices will be closed.