I suggest you incorporate the following ideas to make your virtual conference more engaging:

1. Gamification: Organize an interactive tech-related quiz to heighten excitement and encourage audience participation.

2. Breakout Sessions: Offer themed virtual rooms for attendees to network and discuss specific topics in line with the conference theme.

3. Surprise Performances: Schedule short, surprising intermissions such as a musical performance, magic show, or a stand-up comedian, to maintain energy and intrigue throughout the event.
Our virtual conference theme is 'Future of Technology', and it's scheduled to run for three days with around 500 participants. The conference will have various sessions, panel discussions, and keynote speeches from leaders in the tech industry.
Take the role of a hospitality expert and offer unique suggestions to make a virtual conference more engaging for attendees.