On Saturday, May 16, 2015 at 7:54:18 AM UTC-4, PM wrote:
In the non-contest environment, should we take up slack with the wings level, or with one wing on the ground?

Generally, "wing up" means everything is ready (pattern, glider, glider pilot).
Wing down is "WAIT"!

So, take up slack with wings level (or in our case, we rock the wings to take up slack, thus they're off the ground).