On the night of their 13th birthday, have them take with them any and all items they want to their alone area. In sometraditions the first Full Moon after the girl's first period or the boy's wet dream is also an appropriate time for the ritual. They could have a journal, a box of crafts, music, blanket or a book. Modern electronics and other items such as smart phones, computer, flashy photos, outside noises and TV should be removed from the area.
Ask the Gods to bless the child and help them on the first step of their journey! Say good night and leave them to find themselves! Have a vigil going nearby, so that if any trouble develops, he or she can call out.
They can have a birthday party that following weekend to celebrate socially.
Jeremy Fink and the Meaning of Life