What are some effective ways to structure weekly virtual meetups to ensure maximum engagement and productivity, particularly for groups with diverse schedules and time zones? How can organizers balance the need for structured agendas with the flexibility required to accommodate different participation styles and technical capabilities? What tools or platforms have been most successful in facilitating virtual meetups, and what features are essential for creating an immersive and interactive experience? How can organizers encourage active participation and foster a sense of community among attendees, especially when they are not physically present? What strategies can be employed to handle technical issues or connectivity problems that inevitably arise during virtual meetups, and how can organizers minimize disruptions to the discussion or presentation? How can virtual meetups be designed to accommodate different learning styles and preferences, such as incorporating visual aids, live polling, or breakout sessions? What are some best practices for following up with attendees after virtual meetups to ensure that action items are completed and that the conversation continues beyond the scheduled meeting time?