National Day Calendar
A United States website and online database that catalogs, promotes, and explains national days and other calendar observances.
Last updated August 24, 2026
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Overview
National Day Calendar is a United States-based website and online database devoted to holidays, commemorative dates, and themed observances. Its calendar combines widely recognized occasions, including public and religious holidays, with less formal celebrations and days associated with particular foods, interests, professions, causes, or cultural themes. The service functions both as a reference resource and as a content-distribution platform: listed observances are regularly used by newspapers, radio programs, television producers, social-media publishers, and organizations seeking timely subjects for public engagement. The service was founded on January 19, 2013, by Marlo Anderson. According to the account associated with the site’s creation, Anderson became interested in the lack of accessible information about National Popcorn Day and, after trying unsuccessfully to find a reliable calendar entry for it, developed the idea for a centralized database of national days. The resulting platform expanded beyond a simple list of holidays into a searchable editorial calendar covering established public observances as well as newer and more specialized commemorations. A distinctive feature of National Day Calendar is the presence of sponsored days. Individuals and organizations can pay to have a particular observance listed or promoted, separating the service from a purely governmental or independently standardized holiday registry. This model reflects the way many modern observances are created and circulated: a business, association, advocacy group, or community proposes a day, develops supporting material, and uses the date for publicity or awareness-building. The website therefore occupies an intermediate position between a calendar publisher, an online information database, and a promotional-media service. The calendar’s content is designed for recurring use. Individual dates can provide hooks for local-news stories, radio segments, social-media posts, marketing campaigns, and other forms of seasonal communication. The site’s reach has extended beyond its own web pages through mentions and appearances in mainstream media. Its services were also featured in a 2019 episode of the television program Vanderpump Rules, illustrating the broader entertainment and publicity value of themed calendar observances. National Day Calendar has additionally been associated with an entertainment-development project. In 2018, it was reported that the organization and C3 Entertainment were developing a film inspired by Anderson’s experiences with the calendar, under the working title National Daze. The available reference material does not establish whether that project was completed or released. No reliable information in the supplied sources identifies the company’s headquarters, ownership structure, revenue, public listing, or current executive team beyond the founder. The brand is best understood as an active digital calendar and content platform whose principal value lies in organizing and amplifying recurring observances.
History
National Day Calendar began on January 19, 2013, when Marlo Anderson created a website intended to gather information about holidays and themed observances in one accessible location. The stated inspiration was a failed attempt to find dependable information about National Popcorn Day. Rather than treating the absence of a listing as an isolated problem, Anderson developed a broader calendar and database covering both established holidays and the growing number of informal or specialized days promoted by organizations and communities. The resulting service brought together several different types of observance. Its listings include public and religious holidays that are broadly recognized, as well as themed days connected with foods, hobbies, professions, causes, and cultural interests. This mixture gives the database a wider scope than an official government holiday calendar, while also making it useful to publishers and media producers looking for daily topics. Dates from the service have been used by local newspapers, radio programs, and social-media accounts as prompts for features, short segments, and promotional posts. The platform also accommodates sponsored days. Under this model, an individual or organization can pay to have a particular observance listed on the website. Sponsorship provides a mechanism for groups to establish visibility for a cause, product category, association, or community interest, while the calendar supplies a recurring date around which publicity can be organized. This commercial element is central to understanding the service’s role: it is not only an encyclopedia-like reference site, but also a vehicle for calendar-based marketing and public engagement. As the service became more visible, its calendar content reached television and entertainment media. National Day Calendar was featured in a 2019 episode of Vanderpump Rules. In 2018, reports also described a proposed collaboration with C3 Entertainment to develop a film based on Anderson’s experiences with the calendar, titled National Daze. The supplied references do not confirm the project’s later production or release. The available material does not provide a detailed corporate history, ownership record, headquarters location, financial profile, or succession history. It identifies Anderson as the founder but does not establish a complete current leadership roster. On the evidence available, National Day Calendar is best described as an active United States digital information and promotional brand centered on a recurring database of national days and related observances.
- 2019
Television appearance
[1]The service was featured in an episode of Vanderpump Rules.
- 2018
National Daze development reported
[1]National Day Calendar and C3 Entertainment were reported to be developing a film inspired by Anderson’s experiences with the calendar.
- 2013
National Day Calendar is founded
[1]Marlo Anderson founded the service on January 19 after being unable to locate satisfactory information about National Popcorn Day.
Products and positioning
A centralized, media-friendly reference and promotional platform for discovering, organizing, and sharing national days and other recurring observances.
Online calendar and database · 2013
National Day Calendar website
The core digital service catalogs public holidays, religious observances, themed celebrations, and other national days. It gives users a recurring calendar framework for discovering dates and provides material that can be republished or adapted by news outlets, broadcasters, social-media publishers, and organizations.
Sponsored listing service
Sponsored days
National Day Calendar includes observances supported by paying individuals or organizations. Sponsored listings allow a group to associate a recurring date with a cause, interest, organization, or promotional subject and to gain visibility through the calendar’s audience and media-oriented content model.
Brand decisions
2018
Film development partnership for National DazeOtherBackground
The organization’s experiences and founder’s story were identified as the basis for a potential entertainment project.
Action taken
National Day Calendar worked with C3 Entertainment on development of a proposed film titled National Daze.
Aftermath
The supplied references do not establish whether the film was completed or released.
Recent events
Sling TV launches National Cut the Cord Day[3]
Reported:
Sling TV announced the first official National Cut the Cord Day, created in partnership with National Day Calendar, as part of its fifth-anniversary celebration.
Sources3 sources
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