National conventions are large gatherings held by political parties in the United States to nominate their candidates for the presidency. These events typically occur in the summer of an election year and involve delegates from each state who vote to select their party's nominee. The conventions also serve as a platform to showcase party values and policies. During the convention, party members participate in speeches, rallies, and discussions. Notable figures, including current and former politicians, often address the audience to rally support. The conventions culminate in a formal vote, leading to the official nomination of the candidate, such as Joe Biden or Donald Trump.