Jan. 5 Birth of Guru Gobind Singh
Jan. 31 Birth of Guru Har Rai
Mar. 12 Guru Gaddee/Guru Har Rai
Mar. 19 Joti Jot/Guru Hargobind
Apr. 13 Baisakhi
Apr. 16 Joti Jot/Guru Arjan Dev
Apr. 16 Guru Gaddee/Guru Amar Das
Apr. 16 Joti Jot/Guru Harkrishan
Apr. 16 Guru Gaddee/Guru Teg Bahadur
Apr. 18 Birth of Guru Teg Bahadur
Apr. 27 Birth of Guru Angad Dev
May 2 Birth of Guru Arjan Dev
May 23 Birth of Guru Amar Das
June 11 Guru Gaddee/Guru Hargobind
June 12 Martyrdom of Guru Arjan Dev
Guru Gaddee means the day they became the Guru. Joti Jot means the day they left their bodies.
Each one of the ten Sikh Gurus represents a divine attribute:
Guru Nanak Humility
Guru Angad Obedience
Guru Amar Das Equality
Guru Ram Das Service
Guru Arjan Self-Sacrifice
Guru Hargobind Justice
Guru Har Rai Mercy
Guru Harkrishan Purity
Guru Teg Bahadur Tranquility
Guru Gobind Singh Royal Courage