Create a personal scheduler option for registered users. Users will be able to check off presentations/events that they want to see from a schedule; and subsequently be able to view/print off a personal schedule. Other notes: 

-- users should be able to modify their schedule until the conference closes

-- Conference Managers should have access to how many people are planning to go to any given scheduled event

-- perhaps best as a plugin? 

(courtesy of http://pkp.sfu.ca/support/forum/viewtopic.php?f=13&t=4873&p=18991#p19009)