EventPilot Conference apps for iOS and Android are designed to work natively and offline, but while onsite, attendees will expect internet access.
Deciding how much bandwidth your conference may need is dependent on the type of user activity. For average activity, plan for 200-300 Mbps during the day. If you expect many file downloads (for example you are including PowerPoints or large PDFs in the app), your team should plan for 500 Mbps.