As another try I used
Martindale Reference Desk. Under "International-Countries"
I find "Belize" which takes me to "Country Overview" then "What you should know" which gives:
PUBLIC & BANK HOLIDAYS
New Years Day - January 1; Baron Bliss Day- March 9; Good Friday; Holy Saturday; Easter Monday;
Labour Day-May 1; Commonwealth Day- May 24; St. George's Caye Day- September 10;
Independence Day- September 21; Columbus Day- October 12; Garifuna Settlement Day- November 19;
hristmas Day- December 25; Boxing Day- December 26