All event countdowns in 2021
January
- New Year's Day
- Bloody Mary Day
- January
- Last Quarter Moon
- New Moon
- Martin Luther King Jr Day
- Inauguration Day in US
- US Presidential Inauguration
- First Quarter Moon
- Robert Burns Day
- Australia Day
- Holocaust Memorial Day
- Full Moon
- Self Assessment Tax Return Deadline
February
- February
- Groundhog Day
- Last Quarter Moon
- New Moon
- Chinese New Year
- Valentine's Day
- Presidents' Day
- Mardi Gras (Fat Tuesday)
- Pancake Day
- Shrove Tuesday
- Ash Wednesday
- Lent
- Lent (Catholic)
- First Quarter Moon
- Full Moon
March
- Saint David's Day
- March
- Ghostbusters 3: Afterlife
- Last Quarter Moon
- Commonwealth Day
- New Moon
- Mother's Day in the UK
- Pi Day
- Daylight Saving/Clocks Change in US
- Saint Patrick's Day
- Spring
- March Equinox
- First Quarter Moon
- World Water Day
- The Boss Baby 2
- Palm Sunday
- Clocks Change in UK
- Full Moon
April
- Maundy Thursday
- April Fools' Day
- April
- Good Friday
- Fast & Furious 9
- Easter
- Last Quarter Moon
- Easter Monday
- World IoT Day
- New Moon
- First Quarter Moon
- Queen Elizabeth's Birthday
- Earth Day
- Saint George's Day
- Anzac Day
- Full Moon
May
- May
- May Day
- Last Quarter Moon
- Star Wars Day
- Cinco De Mayo
- Mother's Day
- New Moon
- World Whisky Day
- First Quarter Moon
- World Goth Day
- Towel Day
- Full Moon
- Memorial Day
- Spring Bank Holiday
June
- June
- Last Quarter Moon
- New Moon
- Jurassic World 3
- Flag Day in US
- First Quarter Moon
- Father's Day
- Summer
- June Solstice
- Full Moon
- The Batman
July
- Canada Day
- July
- Last Quarter Moon
- Minions 2
- Sing 2
- Independence Day
- Indiana Jones 5
- New Moon
- Saint Swithun's Day
- First Quarter Moon
- Summer Olympic Games - Tokyo 2020
- Full Moon
- Last Quarter Moon
August
September
- September
- Father's Day (Aus/NZ)
- Labor Day
- New Moon
- Patriot Day
- First Quarter Moon
- Full Moon
- Autumn (or Fall)
- September Equinox
- Last Quarter Moon
October
- October
- New Moon
- Thanksgiving in Canada
- Columbus Day
- First Quarter Moon
- Full Moon
- Last Quarter Moon
- Halloween
November
- All Saints' Day
- November
- Election Day in US
- New Moon
- Guy Fawkes Night
- Singles Day
- Veterans Day
- Remembrance Day
- First Quarter Moon
- Fantastic Beasts and Where to Find Them 3
- Remembrance Sunday
- Beaujolais Nouveau Day
- Full Moon
- Thanksgiving
- Black Friday
- Last Quarter Moon
- Cyber Monday
- Cyber Monday in US
- Saint Andrew's Day