Your event might not actually happen on a holiday but you might want to associate your event with a holiday. Check all the holidays you want.
01-01 New Year's Day
01-15 MLK
02-03 Chinese New Years
02-06 Superbowl
02-14 Valentines Day
02-27 Oscar Night
03-08 Mardi Gras
03-09 Ash Wednesday
03-17 St. Patrick's Day
03-20 Purim
03-20 Vernal Equinox
04-01 April Fool's Day
04-17 Palm Sunday
04-19 Passover
04-22 Earth Day
04-22 Good Friday
04-24 Easter Sunday
05-01 May Day
05-05 Cinco de Mayo
05-08 Mother's Day
05-31 Memorial Day
06-19 Juneteenth Day
06-19 Father's Day
06-21 Summer Solstice
07-04 Independence Day
08-01 Ramadan
09-05 Labor Day
09-23 Autumnal Equinox
09-28 Rosh Hashanah
10-07 Yom Kippur
10-10 Columbus Day
10-31 Halloween
11-01 All Saint's Day
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11-08 Election Day
11-11 Veteran's Day
11-24 Thanksgiving Day
11-25 Black Friday
11-27 Advent
12-07 Pearl Harbor Day
12-21 Chanukah
12-22 Winter Solstice
12-25 Christmas
12-26 Boxing Day
12-26 Kwanzaa