I got subpoenaed to produce 2014, 2015 & 2016 Tax returns for one of my clients.

My questions are:

-I will be traveling on the court date, how can I communicate that to court?

-I already archived the above mentioned years (14,15 &16) and it will take me some time to make them available, again how can I communicate that to court?

- who should compensate me for my time. Of course my client doesn't want me to show up