On trips marked as draft (date is not yet decided), it is possible for all participants to suggest trip dates and vote on suggestions already registered.
To add a new suggestion, just press det "Add suggestion" button, fill in your suggestion and store it by pressing the blue "Add suggestion" button
After it's been stored it will show up in the "suggestion list".
And all participants can vote on the suggestion by pressing "Vote"
Every one who's voted on the suggestion is indicated in the suggestion. You can remove your vote, by pressing "Remove vote"
If you have the necessary privileges to change the trip, you can press the "Choose and remove draft-status" to choose that suggestion.
The trips start and end time will than be set to the suggested time, and the draft status is removed.