Bahá’ís observe eleven holy days each year. These include days associated with the lives of Bahá’u’lláh and the Báb, as well as the Bahá’í new year, on March 21. The most important of the other holidays is Ridván, a twelve-day period in April/May that commemorates Bahá’u’lláh’s declaration of His mission. The holy days are commemorated with community gatherings for prayer, reflection, and fellowship. On nine of these holy days, Bahá’ís abstain from work.