A few things that should be thought about when getting close to the end of a project.
#1: Finalize Testing
#2: Finalize Training
#3: Validate Deliverables
#4: Get Project Signoff
#5: Release The Team
#6: Analyze Actual Vs. Planned
#7: Archive Documentation
#8: Ensure Contract Closure
#9: Conduct a Postmortem Meeting
#10: Perform a self assessment
If done, it always makes the transition to the next project smoother.