I really do understand your concern Damo, but then again.. if all odd days should give access to a special designed Google logo, when would we see the actual logo, and would we not miss these special logos from time to time? If something special is on the menu every day it gets normal.
Holidays:
January
* 1 New Year's Day
* 4 Trivia Day
* 6 Feast of the Epiphany- Three Kings Day
* 15 Martin Luther King's Birthday
* 26 Australia Day
* More January holidays and special days
February
* 2 Groundhog's Day
* 4 Super Bowl Sunday - SuperBowl XLI
* 12 Lincoln's Birthday
* 14 Valentines Day
* 15 Singles Awareness Day - Are you single or in between relations? Then, this day is for you!
* 18 Chinese New Years The year of the Pig.
* 19 President's Day
* 20 Hoodie-Hoo Day
* 20 Mardi Gras(Fat Tuesday)
* 21 Ash Wednesday
* 22 Washington's Birthday
* 25 Oscar Night
* More February holidays and special days
March
* 4 Purim begins at sundown.
* 8 International Women's Day
* 11 Daylight Savings begins, lose 1 hour of sleep (second Sunday of March)
* 15 Ides of March
* 17 St. Patrick's Day
* 21 Spring (Vernal) Equinox
* 21 International Earth Day
* 25 Feast of the Annunciation
* More March holidays and special days
April
* 1 April Fool's Day
* 1 International Tatting Day
* 1 Palm Sunday
* 3 Passover begins at sundown, lasts 8 days.
* 6 National Walk to Work Day 1st Friday
* 6 Good Friday
* 8 Easter Sunday
* 15 Income taxes due
* 16 Patriot's Day third Monday in April
* 22 Earth Day (U.S.)
* 25 Administrative Professionals Day formerly "Secretaries Day" (date varies)
* 26 Take Your Daughter to Work Day 4th Thursday
* 27 Arbor Day always the last Friday in April
* More April holidays and special days
May
* 1 May Day
* 5 Cinco de Mayo
* 8 VE Day, WW II
* 8 National Teacher's Day date varies
* 13 Mother's Day
* 19 Armed Forces Day third Saturday of month
* 24 Victoria Day (Canada)
* 28 Memorial Day
* More May holidays and special days
June
* 6 D Day, WWII
* 14 Flag Day
* 17 Father's Day
* 19 Juneteenth Day
* 21 Summer Solstice (The longest day of the year!)
* More June holidays and special days
July
* 1 Canada Day (Dominion Day)
* 4 Independence Day
* 22 Hammock Day ...relax and enjoy!
* More July holidays and special days
August
* 3 National Watermelon Day
* 10 National S'mores Day
* 13 Left Hander's Day
* 14 V-J Day
* 15 Feast of the Assumption
* 30 National Marshmallow Toasting Day
* - - World Youth Day Not held every year.
* More August holidays and special days
September
* 2 VJ Day, WWII
* 3 Labor Day
* 9 Grandparents Day the first Sunday after Labor Day
* 12 Rosh Hashanah begins at sundown
* 13 Ramadan
* 17 Constitution Day
* 21 International Peace Day (UN)
* 22 Yom Kippur
* 23 Autumnal Equinox
* 28 Native American Day the fourth Friday of the month
* 29 Sukkot begins at sundown
* More September holidays and special days
October
* 1 International Day for the Elderly
* 8 Columbus Day observed second Monday in October
* 8 Thanksgiving Day in Canada, 2nd Monday
* 16 Boss's Day
* 20 Sweetest Day 3rd Saturday
* 24 United Nations Day
* 22 Make a Difference Day 4th Saturday
* 31 Halloween
* More October holidays and special days
November
* 1 All Saint's Day
* 1 Dia de los Muertos (Day of the Dead)
* 2 All Soul's Day
* 4 Daylight Savings time ends, gain 1 hour of sleep (first Sunday in November)
* 6 Election Day - please exercise your right to vote
* 11 Veteran's Day
* 13 Sadie Hawkins Day
* 20 Universal Children's Day
* 22 Thanksgiving Day
* More November holidays and special days
December
* 2 Advent begins
* 5 Chanukah lasts 8 days
* 7 Pearl Harbor Day
* 12 Poinsettia Day
* 21 Winter Solstice (shortest day of the year)
* 25 Christmas
* 26 or 27 Boxing Day find out why the 26th or 27th...this year.
* 26 Kwanzaa
* 27 National Fruitcake Day
* 31 Eid-Ul-Adha
* 31 New Year's Eve
* More December holidays and special days
Other special days (bizarre ones - January only)
1 New Year's Day
2 Run up the Flagpole and See if Anyone Salutes Day
3 Festival of Sleep Day
3 Fruitcake Toss Day
3 Humiliation Day
4 Trivia Day
5 National Bird Day
6 Bean Day
6 Cuddle Up Day
7 Old Rock Day
8 Bubble Bath Day
8 Male Watcher's Day
9 Play God Day
10 Peculiar People Day
11 Step in a Puddle and Splash Your Friend's Day
12 Feast of Fabulous Wild Men Day
12 National Pharmacist Day
13 Make Your Dream Come True Day
14 Dress Up Your Pet Day
15 Martin Luther King Jr. Birthday , celebrated on the third Monday
15 National Hat Day
16 National Nothing Day
17 Ditch New Years Resolutions Day
18 Thesaurus Day
18 Winnie the Pooh Day -The Birthday of Winnie's author A.A. Milne
However, out of all those holidays, which ones are country specific. As google has its regional sites, regional logos such as the St. George's flag for just
www.google.co.uk
would be good - not as if they have nothing better to do :