So glad you'll be attending Inspire. I think you'll find it extremely, well, inspiring! One of the best conferences out there, in my opinion.
No need for ear plugs - it's not loud.
Once they have the official agenda builder up and running, you can build out your personal (self-chosen) agenda. For now, you can check out what "sessions" there will be at https://www.alteryx.com/inspire-2019.
Monday, Tuesday & Friday are for any trainings and/or certifications you may want to take.
Wed & Thu are for "sessions" which are presentations by certain speakers/users/etc. Also on Wed/Thu are some keynote speakers. Usually Wed morning there'll be a big "everybody there attends" keynote and welcoming ceremony. Then Thu a closing one. In between will be all the sessions - again, you can scroll through them all on the site I referenced above to see which ones might interest you.
I would highly suggest reading through them all, and jotting down which ones might interest you, making note of the times. I would then go through all the time slots, and pick 2 sessions for each time slot. You can only do one (obviously), but some you may not want to go to when it comes time - you might need a rest, you might get held up, you might not make it in time, they might be "sold out" by the time you get there, etc. But having more than enough planned ahead of time will be helpful.
Then when they release the official agenda builder, go in and enter your selections.
Also, once the app is up and running, you can connect with other attendees. I usually get the app right away when it's released. Don't hesitate to connect with me and I'd be glad to offer any guidance I can throughout the event!