My uncle's family is holding a one-year memorial and stone unveiling honoring my uncle... on Yom Kippur! I was not close to my uncle but my mother was, and she is urging me to go to this event. I am thinking I should be at services, including yizkor to honor my father, whom I was extremely close with. They are even planning to make it into a celebration of my uncle's life and have food afterwards. My uncle was Jewish and my mom is, but these family members arranging the event are not. What are the principles I should consider and is there a clear imperative in what I should do? What would Jewish law and thought tell me is the way to proceed?