Martyrdom Day of Shaheed Udham Singh is observed every year on July 31. This year again, we celebrate Martyrdom Day of Shaheed Udham Singh 2024 on Wednesday, July 31, 2024. Shaheed Martyrdom Day of Shaheed Udham Singh marks the anniversary of his execution for assassinating Michael O’Dwyer in retaliation for the Jallianwala Bagh massacre.