The official Newgrounds Calendar is full of events which take place annually celebrating people and events of all sorts. Anything from Christmas to Clockday might suddenly be included, with competitions, Collections and a one-day or a seasonal change in the appearance of the Main and Portal pages of the site. Tom announces each celebration on the BBS in advance and sets out rules etc for any competition, including closing dates, prizes etc.
January
Newgrounds Day- Celebrating a new year of Newgrounds
February
- 12th - Soup Fest
- 14th - Valentine's Day
March
- 17th - St.Patricks Day
April
- 1st - April Fools' Day - Celebrated each year with a new practical joke
- 23rd - Star Day - A Star Syndicate Holiday
- 30th - Pico Day - Celebrates Newgrounds's Mascots from the Pico Series and Tom Fulp's Birthday
May
- 26th - Lock Day
June
July
- 10th - Robot Day
- 18th - Glock Day
August
- 15th - Clock Day - celebrating the passing through judgment of the movie "B", upon which the Clock Crew are founded.
September
- 22nd - Madness Day - Celebrates the Madness Series
October
- 25th - Ban Day- Any Lock who doesn't make a submission for this day is banned from their forum.
Replaced Level pix on Halloween 2010
- 31st - Halloween- Annual Celebrations, with competitions. There is a main Collection for Halloween and separate Collections for each year since 2000. On 30th October 2010, all user's level Pix were changed to a variety of Halloween Pix.
November
December
- 25th- Christmas