Practicing civility at the mediation session also produces unmistakable dividends, starting with your credibility with the mediator.
Consider using this time of summer optimism to extend an olive branch to your adversaries. Respect that they have families to spend time with, just as you do, and their own plans for time off. Extend them common courtesies regarding extensions of time and deposition scheduling. Share stories of great vacations and time away from work. View them as people as well as adversaries.