This article from Chabad.org contains a list of all of the opportunities to honor family and friends during a Shabbat morning synagogue Bar Mitzvah service. With links to learn more about how to fulfill each of these honors, this is an excellent resource for those who wish to follow Orthodox tradition, regardless of their background. Among the kibbudim (honors) described in this article, are being called up to the Torah for an aliyah, opening the ark, hagbah (lifting the Torah), gelilah (dressing the Torah), and placing the tallit on the Bar Mitzvah boy. Please note that each community and synagogue will have their own norms and customs when it comes to which honors are available and to whom.