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
• 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
• 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
• Independence Day
• Indiana Jones 5
• New Moon
• Saint Swithun's Day
• First Quarter Moon
• Full Moon
• Last Quarter Moon

August

• August
• New Moon
• Friday the 13th
• First Quarter Moon
• Full Moon
• Summer Bank Holiday
• Last Quarter Moon

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
• Remembrance Sunday
• Beaujolais Nouveau Day
• Full Moon
• Thanksgiving
• Black Friday
• Last Quarter Moon
• Cyber Monday
• Cyber Monday in US
• Saint Andrew's Day

December

• Puss in Boots 2: Nine Lives & 40 Thieves
• December
• New Moon
• First Quarter Moon
• Avatar 3
• Full Moon
• Winter
• December Solstice
• Christmas Eve
• Christmas Day
• Boxing Day
• Last Quarter Moon
• New Year's Eve