In densely populated occasions such as large-scale public gatherings or festivals, there are some factors that may be used by criminals to carry out imperceptible theft activities, as follows： ### Personnel factor 1. **Crowded crowd cover** -During gatherings or celebrations, a large number of people gather to form a crowded environment. Thieves can use the cover of the crowd to quietly approach the target and reach out to commit theft, such as unzipping the backpack, pulling out the pocket, etc., it is difficult for the surrounding people to detect the specific actions. -For example, at a lively music festival, the audience sways to the rhythm of the music and the crowd is crowded, so thieves can easily mix in and commit the theft while others are unprepared. 2. **Distraction** -There are usually various wonderful performances and attractive displays at the event site. People's attention is often attracted by these, and it is easy to ignore the safety of their own property. Thieves take advantage of this, and when people are engrossed in the show on the stage or the novelty around them, they are unaware of their theft. -For example, during the grand National Day celebration, everyone is focusing on watching the military parade and other exciting events. Thieves may quietly steal mobile phones, wallets and other items from the crowd. 3. **Special dress personnel** -Some criminals will pretend to be active staff, such as wearing costumes similar to security personnel and volunteers. With this dress, they move freely on the scene, and it is not easy to arouse suspicion from others, making it easy to approach the target to commit theft. -For example, at the scene of some large-scale commercial promotions, thieves wear overalls similar to those of promotional personnel and mix into the piles of customers and goods, looking for opportunities to steal customers' belongings or steal goods. 4. **Gang crime** -Thieves will form gangs and work together in a division of labor. Some people are responsible for creating chaos, such as deliberately pushing and shoving in the crowd, quarreling, etc., to attract the attention of the people around them; others take the opportunity to commit theft. In this way, under the cover of chaos, theft is more difficult to detect. -For example, at the market celebration, several members of the thief gang first caused a quarrel in an area to attract everyone to watch. The thieves in the gang took advantage of the time when people were paying attention to the quarrel to steal the belongings of the surrounding stalls or passers-by. ### Environmental factors 1. **Dimly lit areas** - There may be some low-light corners at the event site, such as shaded areas of buildings, remote aisles, etc. Thieves will choose these places to commit crimes, because the dim light makes their movements not easy to see clearly, and the chance of being discovered is reduced. -For example, on the edge of an outdoor music festival venue, there are several dim corners shaded by trees. Thieves may wait here and commit thefts on passers-by. 2. **Noisy environment masking** - Gatherings and celebrations are usually accompanied by noisy music, crowd noise, etc. The slight sound during theft can easily be masked by this noisy environment. Thieves can carry out the theft with more confidence without worrying about being exposed by abnormal sounds heard by the people around them. -Like in a noisy carnival scene, the sound of thieves gently zipping other people's backpacks to take away their belongings will be drowned out by various sounds of music and people's shouts, making it difficult to detect. 3. **Chaotic placement of items** -There are generally many stalls and display areas on site, and the items are messy. Thieves can take advantage of this chaos to mix the theft target into it, or it is not easy to find when rummaging through items. For example, at a trade fair celebration, thieves hid or stole some valuable goods in many commodity stalls while merchants and customers were not paying attention. -And the chaotic environment also makes people's own memories of the location of their belongings blurred, even if they are stolen for a while, it is difficult to detect. 4. **Temporary facility shelter** -Some temporary stages, tents and other facilities set up at the event site will form some visual blind spots. Thieves can hide behind these temporary facilities to prepare for theft or commit crimes, and then escape quickly, making it difficult for others to discover their whereabouts. -For example, at an outdoor wedding celebration site, there is a blind spot behind the large tent next to the stage. Thieves may observe the surrounding situation here and choose the right time to commit theft on guests at nearby events.