Get events and holidays for today (or any other day).
// Get events for a date
$events = OnThisDay::getEvents('1/1/2016');
// Get holidays for a date
$events = OnThisDay::getHolidays('1/1/2016');
// Get events and Holidays for a date
$events = OnThisDay::getEventsAndHolidays('1/1/2016');
An 'event' is generally one of those fun, interesting, or informative dates that various organizations come up with. Some examples are 'National Coffee Day' or 'Talk Like a Pirate Day'.
A 'holiday', on the other hand, is one of those days for which you got off from school or send someone a card. Some examples are New Year's Day, Valentine's Day or the 4th of July.