'If need be' allows you to indicate that you can make a selected date if necessary (i.e. it is not your preferred date and time to meet, but you could make it if you have to).
How to vote 'if need be'
To vote if-need-be on a group poll, click twice on the time slot checkbox. The time slot and checkbox will appear yellow. Don't forget to click the 'Continue' button on the bottom of the screen to finalize your votes and submit them to the event organizer.
The event organizer will see who has voted 'if need be' for each time slot.
