I have a few standard on having Productive Meetings that I keep to:
Meetings start on time
Commit to ending time
Everyone participates

I recently saw an article about meetings that made me laugh. Evidently Amazon CEO, Jeff Bezos uses pizza as a metric for the size of his teams. How? If a team can't be fed by 2 pizzas, it is 2 large. I like it!
I wonder if there is something special in the pizza sauce there at Amazon?