1. In terms of nature, large-scale activities can be roughly divided into three categories: "political," "social," and "commercial." "Political" events are mainly organized by the government. The attendees have a high status and political influence, and a small proportion of such events. "Social" and "commercial" events are mainly sports competitions, exhibitions, Celebrations, public welfare undertakings, and other activities organized by social groups and business units. The general participants are mainly members of the community, and their specifications, levels, and influence are relatively low. Such activities account for the vast majority.
2. From the perspective of content, large-scale activities can be divided into three types: celebration, stylistic, and religious activities. Among them, the proportion of the first two types accounts for a large part, and the hidden safety hazards are more prominent than the religious activities. Religious activities are not very obvious due to their relatively standardized requirements and stable forms.
3. In terms of scope, large-scale activities can be divided into three categories: regional, national, and international. The social influence of these three types of large-scale activities is increasing in turn, and their security risks are also increasing in turn.
4. From the perspective of administrative license requirements, it can be divided into two types: large-scale activities that require administrative permission and large-scale activities that do not require administrative permission. Large-scale activities that require administrative permission can be divided into large-scale activities that require the permission of public security organs and large-scale activities that require the permission of the people's government. Large-scale events that require permission from the public security organs are mainly mass cultural and sports activities under normal circumstances, while large-scale events that require permission from the people's government mainly refer to large-scale events held under special circumstances. Special circumstances include: national or local important meetings; major events; large-scale events held in key cultural relics protection units, airports, railway stations, ports and other important places, and so on. Large-scale events that do not require administrative permission mainly refer to large-scale events organized by the government (such as the Olympic Games and the World Expo) and regularly held (such as the National People's Congress and the National Games).