Virtual Event Handel portal and app

We need to build a virtual event management portal. Basic features should be : 1. Event Details 2. Tickets 3. Registration 4. Key details 5. Event Area 6. Session details 7. Networking (one to one, Group etc) 8. Stage 9. Session 10. Chat and Poll We will provide the sample/benchmark items to interested worker. Developer platform and database need to suggested by worker. We are open to discuss