Foursquare Day (4SQDay)2026 · Date · History
Foursquare’s own material describes 4SQDay as an annual community holiday centered on April 16, with community events sometimes scheduled around that date.
About Foursquare Day (4SQDay)
Foursquare Day, often written 4SQDay, is a grassroots social-media and local-community observance associated with April 16.
The date is a numerical play on the Foursquare name: April is month four and 16 is four squared.
Why Foursquare Day (4SQDay) matters
The observance began with Foursquare users in Tampa and spread through online communities and local meetups.
Its history illustrates how a community-created idea can receive brand support and local government recognition without becoming a statutory public holiday.
History of Foursquare Day (4SQDay)
Contemporaneous Tampa reporting identifies optometrist Nate Bonilla-Warford as the originator and April 16, 2010 as the first Foursquare Day.
A City of Tampa proclamation later described Foursquare Day as a grassroots movement started in Tampa in 2010 by Bonilla-Warford.
Foursquare’s own 2019 recap called Foursquare Day an annual holiday, described global Superuser meetups and explicitly explained the 4 × 4 = 16 date pun.
The available first-party record establishes past brand/community recurrence but does not prove one exclusive current organizer for every modern edition.
How the observance developed
This timeline uses documented milestones from reviewed sources. Missing stages are left out rather than guessed.
Nate Bonilla-Warford
The City of Tampa and contemporaneous Tampa reporting identify Bonilla-Warford as the originator of the grassroots Foursquare Day movement.
First documented observance
Contemporaneous Tampa reporting identifies April 16, 2010 as the first Foursquare Day launch.
Recognized Foursquare Day locally and described it as a grassroots movement started in Tampa in 2010.
City of Tampa · Mayor of Tampa Foursquare Day proclamation
What the evidence establishes
Confirmed institutional roles and milestones are shown first. Details that could not be established from the reviewed sources are listed separately below.
6 fields not established in reviewed sources
Later institutional actions
Later recognition, renaming, mergers or date changes are kept separate from original establishment.
Also known as
Foursquare Day, 4SQDay
How to Observe Foursquare Day (4SQDay)
Use April 16 as the core recurring date while noting that community events can be scheduled around it.
Explain the 4 × 4 = 16 date logic when describing why April 16 was chosen.
Treat municipal proclamations as local recognition, not as national or international legal status.
When discussing modern editions, separate Foursquare corporate participation from independent community meetups.
Foursquare Day (4SQDay) Facts
Foursquare Day is associated with April 16.
Nate Bonilla-Warford is documented as the grassroots originator.
The first major edition was held on April 16, 2010.
The date uses the numerical joke that four squared equals 16.
Foursquare itself later described 4SQDay as an annual community holiday.
Topic and context
What this page does not assume
- Keep the source-defined country, community, organizer or institutional scope; do not silently broaden it.
- Do not treat the title alone as proof of government recognition or public-holiday status.
- Do not add a creator, founding story or origin claim unless the supporting evidence establishes it.
Evidence & sources
Sources used across the guide are gathered here. Labels show how each source supports the page, and contextual references are kept separate from primary evidence.
City of Tampa (opens in a new tab)
Foursquare — 4SQDay celebrations (opens in a new tab)
Brand First Party
83 Degrees Media (opens in a new tab)
Understand it, compare it, then explore further
Start with the most common factual questions, then compare closely related observances and explore useful connections.
Frequently asked questions
When is Foursquare Day (4SQDay)?
16 April The documented recurrence rule is: 16 April.
Does Foursquare Day (4SQDay) fall on the same date every year?
Yes. It uses a fixed annual date unless stronger evidence changes the pattern.
Is Foursquare Day (4SQDay) an official public holiday?
The reviewed sources verify it within this scope: Foursquare user/Superuser community / brand-community observance. That recognition does not by itself make it a statutory public holiday; the site only makes public-holiday claims when reliable evidence explicitly does so.
Who established or recognizes Foursquare Day (4SQDay)?
The documented basis is: Foursquare’s own material describes 4SQDay as an annual community holiday centered on April 16, with community events sometimes scheduled around that date.. Supporting evidence includes Foursquare — 4SQDay celebrations. The site does not infer a separate creator or founder unless reviewed evidence establishes one.
Is Foursquare Day (4SQDay) international or country-specific?
No single country is assigned to this observance. Its documented scope is: Foursquare user/Superuser community / brand-community observance. Use that scope rather than assuming worldwide or country-specific status.
How is this page verified?
The factual information is checked against reviewed sources, including the date pattern, scope and institutional history. This page was checked on 2026-09-09.
When is Foursquare Day?
It is associated with April 16, written 4/16.
Why April 16?
The date is a numerical pun: April is the fourth month and four squared equals 16.
Who started Foursquare Day?
Contemporaneous Tampa reporting and a City of Tampa proclamation identify Nate Bonilla-Warford as the originator of the grassroots movement.
Is Foursquare Day a government holiday?
No. Some cities recognized the community event, but those proclamations are local recognition rather than statutory national holiday creation.
Other observances on April 16
These observances are also listed on April 16, 2027.
International Documentary Day
Organizer-side launch material describes April 16 as an annual documentary observance beginning in 2026, and current calendar coverage likewise specifies April 16 every year.
José de Diego Commemoration Day
Puerto Rico law preserves April 16 as a commemorative day for José de Diego while distinguishing it from the consolidated Próceres public holiday.
National Bean Counter Day
National Day Calendar credits Connecticut CPA Kevin Wenig with founding National Bean Counter Day on April 16; Hartford Business Journal independently identified Wenig as the local accounta…
National Healthcare Decisions Day
The Conversation Project states that National Healthcare Decisions Day is an annual April 16 initiative founded in 2008 by attorney Nathan Kottkamp to encourage advance-care-planning conver…
World Voice Day
World Voice Day Committee and international voice-health community