Perhaps the human brain understands the reward-mechanism so well.
I promised myself a Venti ( the tallest for a Coffee at @starbucks ) post finishing a task.
The task
Assigned.
Processed.
Finished.
and
Celebrated.
And that perhaps could work well for your #team tasks as well.
Its a Saturday evening and am sure someone in your team deserves a tall glass of the best coffee in town.