Ayyam-i-Ha, or the Intercalary Days, is a period dedicated to socializing, being hospitable, giving generously to the poor and needy, and preparing for the upcoming month of fasting. Depending on the year, Ayyam-i-Ha will vary in its duration and it is composed of the excess of days that fall outside of the 19 months of 19 days (if you’re curious, here’s more information about the Baha’i, or Badi, Calendar). In the Kitab-i-Aqdas, Baha’u’llah writes:

Let the days in excess of the months be placed before the month of fasting. We have ordained that these, amid all nights and days, shall be the manifestations of the letter Ha, and thus they have not been bounded by the limits of the year and its months. It behooveth the people of Baha, throughout these days, to provide good cheer for themselves, their kindred and, beyond them, the poor and needy, and with joy and exultation to hail and glorify their Lord, to sing His praise and magnify His Name; and when they end—these days of giving that precede the season of restraint—let them enter upon the Fast.