1. Activity restrictions: Some popular exhibition areas or activities may be limited in number. In order to ensure participation, people may queue up in advance. In this way, you can enter the exhibition area or activity venue in advance to avoid the situation that the number of people reaches the limit and you can't enter.

2. Scarcity: For some special tickets or limited tickets, such as VIP tickets and limited autograph sessions, it is common that demand exceeds supply. In order to ensure that they can buy their favorite tickets, people may queue up in advance.

3. Priority admission: queuing in advance can ensure early entry into the exhibition hall, avoiding crowds and waiting time in line. In this way, you can visit the exhibition in advance, buy surrounding goods or participate in activities to enhance the exhibition experience.