Getting your badge at the airport is usually much quicker than going through the registration lines at the main hotels.
If you want to ask questions, chalk talks are your best bet since they’re interactive and allow for deeper discussion. They are not recorded, while breakout sessions are.
The “hallway track,” where you talk to people waiting in various lines is often a highlight, but if you’re an introvert watch out for “over-peopling!”
Leave plenty of time to wander the Expo, wear comfortable shoes, and stay hydrated. A backup power brick for your phone is always a good idea.