The Wikimedia chapter decided to move forward with their Wiki Loves Monuments with a theme of small and rural towns during the month of September. They realized that they needed to know —while the program was taking place— whether they would meet their set targets by the end of the month.
Monitoring is typically focused on the progress of both the preparation and execution of one's program. For example, how much volunteer effort was going into planning the event? Did they reach the number of volunteers we needed? Are the travels to small towns productive? What was the result of these activities in terms of participation or photo uploads at the beginning of September? Mid-september? End of September? Did they get the 20 participants they wanted?
The chapter prepares a Monitoring report with all this information to present at their weekly meeting to discuss their progress towards their goals.