Every opportunity to celebrate should be taken. Acknowledge the involvement of certain classes that finish their fifth or 10th projects. Put the door tags in places where they will be seen to show the success of individual classes. The plan might be to have a different theme focus for activities each month of the year. Planning might include a five minute update for new ideas at each staff meeting.
Some schools decide to continue further.
For schools completing their 'JADE status', it involves carrying on to 500 projects total. This involves carrying on to 1000 projects total. Schools can opt to order new log books or to use their own version of recording projects. Wall charts are available. See here for a letter from an Earth School.