Offer to help during a build session/ maintenance day. It's most likely someone has a ton of hours put into that pumptrack/dj/trail and they would be appreciative if you offered to help.
Today was supposed to be the final build day of the new jump line and including myself, 3 people showed up. Spent the whole session juggling between installing the final set of poles so the track can be locked up, getting dirt in order dial in the hip at towards the end of the track. Would have preferred to have let the final poles out, but that section of trail got poached by some kids who managed to completely screw up the lip on Monday. The person who built that lip had it perfect and is now angry that it was screwed up before it was ready.
Finally, small side projects on the pump track itself, I'm extending some rollers in order to keep momentum into a feature that I came up with. I had help the first build session to get the dirt needed over there, but since then I have been working on this section on my own(prefer for this feature to be done on my own since I know in specific detail on how it is to work and how to build it.) Because of the low turnout was not able to get to that, leaving me 7 days to complete it needs a day to dry and bake. There's an event on July 9th and that is supposed to be the grand opening of the new jumpline and this feature.
Had a bunch of people initially show up to ride but instead of helping with the building, they vanished. These people frequent the pump track daily and are asking when the jump line will be complete.