“An expedition is over only once everything is ready for the next one” (REF, surviethon)
Ask you team for feedback. This can be done on the trip back or during lunch on the last day, there is no need for a big setup.
Update and improve your packing list: what did you miss? what was not useful?
Clean and put away the equipment. The next fieldtrip will be so much easier if you have done that.