The National Convention today have lost the aura of deliberative bodies that with arduous and deep debate, the nomination is decided. By the time the National Convention is held it is clear who has won the primaries as it is assumed the delegates will accept the people's mandate. In contrast, the conventions are really important for the parties and the order of events sets the tone for the presidential campaign. So, first the convention opening includes many small events and speeches to create a good political climate in the air. Also, the party drafts and presents the platform, this is done before formally nominating a candidate, but it is done with the winning candidate platform in mind, the timing however, allows other influential party members and the runner up to be part of the platform, showcasing unity. The election of the vice president nominee has a similar role, the vice president gives a speech to rally the party ranks and the voters. As the final step, the presidential nominee is presented, by this time she has had time to tie any loose ends and get the party full. Hope this helps.
