By popular demand, we’ve added Pesach Sheni, a minor holiday that comes every year on the 14th of Iyyar, one month after Passover.
We have also added Erev Purim and Erev Tish’a B’Av dates to the Hebcal calendar on the days prior to Purim and Tish’a B’Av. Previously the “Erev” dates were only displayed for major yom tov holidays, but both of these holidays have significant evening-time congregational events associated with them.