5. The Shabbos before the Bar Mitzvah:
On the Shabbos before the Bar Mitzvah, some communities are accustomed to give him the Aliyah of Maftir. This is not the Chabad custom.
 See Nitei Gavriel chapter 6
 Levushei Mordechai 1:37; See Tzitz Eliezer 7:1; Piskeiy Teshuvos 282:8 and footnote 87 and 92 that the Shabbos before the Bar Mitzvah some say one may be lenient even regarding Maftir of the four Parshiyos; See also Piskeiy Teshuvos ibid and 284:2 and Poskim in footnote 16