At a coworker gathering, if you want to avoid frequent interactions with the office cleaner, here are some strategies to consider: 1. **Find topics**: Try to have more in-depth conversations with coworkers, choose some common work topics or topics of interest, so that you can reduce direct interactions with the cleaner. 2. **Choose seats**: Choose a seat close to friends or familiar colleagues at the gathering, so that you can more naturally focus on them when talking, reducing the chance of interacting with the cleaner. 3. **Participate in group activities**: If the gathering has games or group activities, try to choose to be in the same group with familiar colleagues, so that you will naturally reduce your interactions with others. 4. **Appropriate courtesy**: If necessary, occasionally say hello, you can greet in a brief way, be polite but not in-depth, so as to reduce the interaction time. 5. **Use your phone**: If you feel uncomfortable, you can use your phone appropriately, check messages or send messages, so as to reduce eye contact with people around you. 6. **Focus on food and drinks**: Give yourself some time and space by making multiple trips to the buffet or beverage area, and reduce your interactions with others. In summary, while maintaining good social etiquette, adopting some strategies can help you better manage your interactions with different people at parties.