I am in mourning for my mother for the whole year am i allowed to go to my grandaughters graduation. also the same night my grandaughter is graduating i have yahrzeit for my daughter what is the halacha thank you
You may go to the graduation as long as there isn’t music being played.
The restrictions of not having joy on a yahrtzeit only applies to the yahrtzeit of a parent, therefore attending the graduation will not be affected by the yahrtzeit.
Tziunei Halacha pg. 499-500, Divrei Sofrim chap 65 ftnt. 42.