We still don't know what his mother meant by.
This year, on the 29th of October, the last time he left home, we will put the ghosts of our past to rest while forever keeping Brandon alive in our hearts.
That sounds like she has a plan for today. It wouldn't hurt to keep an eye out for it.
I'll be honest, I have been wondering if the Devoted really stole Bradon's backpack or perhaps we go with the simpler answer. She gave it to them willingly. Still, it's just a theory.