April, this is my first year attending as well but I believe last year Marketo sent out an email prior to the Summit with details on how to download the app which has all the info on speakers, sessions, etc.
Yes, there will indeed be an app for Summit! I would advise downloading it and creating a schedule in advance so that you always know where you're going next. Moscone Center is pretty big, and sometimes you don't have a ton of time to get from one place to another between sessions!
Will there be particular dates and times for attendees to sign up for sessions beforehand?
This is my first time at Summit too! Looking for any pointers on must do's. April Hammons, might help to partner up with someone. A few members of the Houston MUG are splitting up sessions in order to cover more ground. Then we'll be able to give highlights during our MUG meetings.