You can export all your agenda items saved in "My Agenda" to ical by tapping the icon in the upper right corner.
A few important things to note about this functionality:
1) You can only sync items to ical, not any other calendar on your phone.
2) Please do not export until you have added all of the sessions you will be attending to "My Agenda". If you add some items and then tap export, and later on add some additional items to "My Agenda" and export again, all of the items you had from the original export will show twice on your calendar (since they've now been exported twice from "My Agenda").
3) When you export your sessions to your device calendar, it will export in your current time zone. This means if the event is in a different time zone, your sessions will be off sync with the actual event. We advise waiting until you arrive at the event to export your sessions to your calendar.