Well thats easy enough. If he doesn't bring it up by the end of the weekend, you might casually mention to him WHEN HE CALLS YOU for something else, that you "almost forgot that the court date is coming up on X date, is there anything HE wants you to discuss with YOUR L regarding what to do next? your L said something about needing to some time to prepare some documents in advance.." or whatever you can think of which puts the control of that situation in his court. I agree it must be handled gently, so I'd gently remind him and see how he responds..
