An allegiance is a joint meeting or conference of two or more allegations (see allegation). As you will know if you’ve been paying attention, an allegation is a delegation that includes as many people as possible. And, if you weren’t paying attention, after reading the previous sentence you either now know or are incapable of ever knowing.
Allegiances are popular because of the cost savings they make possible. Because allegations are comprised of as many people as possible, there is considerable overlap in the memberships of just about any two or more allegations. By holding joint meetings and conferences, holding allegiances allows the various allegations to share the costs of the meeting or conference facilities. In addition, attendees will incur travel, lodging and meal expenses for only one meeting or convention, rather than for each of the allegations to which they belong.