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Evergreen date guide

What is celebrated on September 23?

See the observances and verified observance-history milestones attached to September 23. Each observance keeps its own source and date details.

Verified history

On this date in observance history

Today in history →

Selected observance milestones connected to this date, based on reviewed sources.

2021
First observance

National Apple Cider Vinegar Day

The day was created in May 2021 and is listed in contemporary 2021 calendars on September 23; this establishes the first-year observance in the reviewed record.

2016
First observance

National Snack Stick Day

Klement’s dated launch release on September 23, 2016 describes the company celebrating National Snack Stick Day that day.

About this date

What this date contains

8 observances

Each observance is shown once in this view, with its own source and scope details available on the guide page.

0 repeat predictably

0 use a fixed annual date and 0 follow a reusable calendar rule.

0 are edition-specific

These dates are shown only for the year or edition that has been confirmed.

4 have a country-specific scope

Country-specific observances are not presented as worldwide events.

8 have in-depth guides

These pages include reviewed meaning, history, activities, facts and FAQs.

Curated global anchors

Major global guides on September 23

See the collection →

A reviewed starting point drawn from prominent global observances with strong institutional or organizer sources. Each observance keeps its own documented status and scope.

Reviewed depth

Other in-depth guides on September 23

Source-backedFixed AnnualIn-depth guide

Celebrate Bisexuality Day

23 September annually in the cited GLAAD community calendar · International bisexual+ community visibility and awareness observance

Boston City Council’s 2025 resolution records the observance as first celebrated on 23 September 1999 and founded by Wendy Curry, Michael Page and Gigi Raven Wilbur; GLAAD’s current communi…

Source-backedFixed AnnualIn-depth guide

National Apple Cider Vinegar Day

23 September · United States / Bragg-created brand observance

Bragg states that National Apple Cider Vinegar Day is celebrated on September 23 and identifies the observance as a Bragg-created campaign.

Source-backedFixed AnnualIn-depth guide

National Field Marketer’s Day

23 September · United States / Splash-created field-marketing recognition observance

Splash created the inaugural National Field Marketer’s Day for September 23, 2021 and stated annual intent; official Cvent community material for Splash continued the September 23 celebrati…

Source-backedFixed AnnualIn-depth guide

National Great American Pot Pie Day

23 September · United States / Marie Callender’s-created food observance

National Day Calendar records September 23 as National Great American Pot Pie Day and attributes creation of the observance to Marie Callender’s in 2002.

Source-backedFixed AnnualIn-depth guide

National Snack Stick Day

23 September · United States / Klement’s-created snack-stick celebration

Klement’s company history states that it founded National Snack Stick Day in 2016 and ties the celebration to September 23.

Source-backedFixed AnnualIn-depth guide

RLS Awareness Day

23 September annually · International RLS/WED awareness observance associated with the RLS Foundation and partner patient/scientific groups; September 23; health-awareness content remains non-diagnostic and non-prescriptive

RLS Foundation materials identify September 23 as RLS Awareness Day, explain that the date is Professor Karl-Axel Ekbom’s birthday, and document a 2012 international WED/RLS awareness coali…

Explore the mix

Topics represented on September 23

All topics →
Food, Drink & Hospitality 3Community, Causes & Advocacy 2Workplace, Professions & Appreciation 1Health, Wellness & Awareness 1Animals, Nature & Environment 1
8 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

Celebrate Bisexuality Day

23 September annually in the cited GLAAD community calendar · International bisexual+ community visibility and awareness observance

Boston City Council’s 2025 resolution records the observance as first celebrated on 23 September 1999 and founded by Wendy Curry, Michael Page and Gigi Raven Wilbur; GLAAD’s current communi…

Source-backedFixed AnnualIn-depth guide

National Apple Cider Vinegar Day

23 September · United States / Bragg-created brand observance

Bragg states that National Apple Cider Vinegar Day is celebrated on September 23 and identifies the observance as a Bragg-created campaign.

Source-backedFixed AnnualIn-depth guide

National Field Marketer’s Day

23 September · United States / Splash-created field-marketing recognition observance

Splash created the inaugural National Field Marketer’s Day for September 23, 2021 and stated annual intent; official Cvent community material for Splash continued the September 23 celebrati…

Source-backedFixed AnnualIn-depth guide

National Great American Pot Pie Day

23 September · United States / Marie Callender’s-created food observance

National Day Calendar records September 23 as National Great American Pot Pie Day and attributes creation of the observance to Marie Callender’s in 2002.

Source-backedFixed AnnualIn-depth guide

National Snack Stick Day

23 September · United States / Klement’s-created snack-stick celebration

Klement’s company history states that it founded National Snack Stick Day in 2016 and ties the celebration to September 23.

Source-backedFixed AnnualIn-depth guide

RLS Awareness Day

23 September annually · International RLS/WED awareness observance associated with the RLS Foundation and partner patient/scientific groups; September 23; health-awareness content remains non-diagnostic and non-prescriptive

RLS Foundation materials identify September 23 as RLS Awareness Day, explain that the date is Professor Karl-Axel Ekbom’s birthday, and document a 2012 international WED/RLS awareness coali…

Source-backedEdition SpecificIn-depth guide

September equinox (Northern Hemisphere fall equinox)

23 September 2026 at 00:05 UT · Astronomical event / Northern Hemisphere seasonal naming

The U.S. Naval Observatory calculates the September equinox as an astronomical instant: 23 September 2026 at 00:05 UT and 23 September 2027 at 06:02 UT. The Northern Hemisphere calls this t…

How dates are selected

This page combines fixed annual dates, reusable calendar rules and year-specific dates confirmed for 2026. Variable or historical dates are included only when they are clearly supported.

Read the methodology →