I think you are either a "dates" person or you aren't. I am one. I can tell you the dates my grandparents all died, my pets all died and I've only lost my Mom, but when she died. I lost 4 pregnancies, I know my due dates for those and when those dates roll around I still think of those as well. My husband isn't a dates person... he knows his Mom's passing date and our dog's passing dates but aside from those, he doesn't keep track of the others. I don't dwell in sadness on the dates when they happen, I try to remember the people (or dogs) and smile or if they were my pregnancies that didn't work out I know G-d had a different plan. I don't believe people who have died would want us to mourn forever, they would want us to be able to cherish our good memories. We are still living!