Use a level-of-detail calculation to count the Rig Descriptions. Then right-click on the Rig Descriptions pill on the Filters shelf and choose "add to context" (pill then turns grey). The LOD calculation will now only count Rigs that have been selected in the filter. Make sure that the date filter is not added to context (remains blue or green, depending on how you are using it). Since the date is not part of context, the LOD calculation will ignore it when counting the number of Rig descriptions.
I like it, Eric!
(Note: No other filters can be in context like State is.)
Thank you so much, does exactly what i need .