Getting people together in public places in a short period of time requires effective communication and organization. Here are some common methods: 1. **Social media**: Use platforms such as WeChat, Weibo, Facebook, Twitter, etc. to post information, which can quickly spread the news of the event. 2. **Instant messaging tools**: Send invitations to groups through WeChat groups, QQ groups, WhatsApp, etc. 3. **Email**: Send email invitations, especially to specific groups or members of organizations. 4. **Flyers and posters**: Distribute flyers or post posters in public areas or specific places. 5. **Phone**: Notify by phone or text message, especially for people without Internet access. 6. **News media**: Notify the public through press conferences, press releases or TV broadcasts, suitable for large-scale mobilization. 7. **Community networks**: Mobilize through local community organizations or volunteer networks. 8. **Word of mouth**: Use the power of interpersonal communication to spread information quickly through word of mouth. 9. **Event apps**: Use app platforms such as Eventbrite or Meetup to post event information and invite participants. Please note that when organizing public gatherings, you must comply with relevant laws and regulations to ensure the legality and safety of the activities.