The word 召开 is formed by combining two characters: 召, which means "to summon" or "to call together", and 开, which means "to open" or "to begin". Together, they create a single concept that visually and conceptually represents the action of "calling people to gather in order to open or commence a meeting or conference". It’s a metaphorical blend where the act of summoning (召) initiates the unfolding or starting (开) of a collective event.