I’m not Black, is it okay if I attend the event?

Of course it’s okay if you attend the event.   The requirements for attendance have nothing to do with race.   If you are authentically concerned about helping the black community move forward and unify, then this is an event for you.   If you have listened to, studied or know of the great works of Malcolm X and you have an appreciation for him, then yes please attend and do what you can to spread the word.