The Rebbe would have preferred if all people attending his Levaya. Instead go to any Bais Medrash and learn for the same 3 hours as a zchus for him and for all he did for klal Yisroel for the 95 years he was an eved Hashem serving Hashem 24-7
May his neshama have an aliya.
Make a 1 hour daily/weekly learning Seder as a special zchus for his neshama and as a sign of appreciation for all the Rebbe did FOR YOU any time you needed help from him.