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The organizer can add a poll or vote for each event. You can do it on the page for creating or editing events. For example, to MobileBeachConference-2016 App have been added voting for the best start-ups and swimsuit competition (voting works only in mobile app). Organizer can start a survey for visitors before the event and find out what topics will interest them the most. Or create a poll “which speach was the best”.
How to add voting: