We have multiple tracks for our event and would like to track or ask during the registration process which of the 3 they are most likely to attend.  This will help us determine which rooms we need to set these session in since they hold different amounts of folks or may have to be reconfigured to maximize attendees.  I also want to ask for food allergies for the catering company as well. 

For now I created a ticket for each track as a work around, however I am afraid folks will think they need to attend that one and can't change so they may not register until the last minute.  

How have others handled this?