As a large team, we volunteer 3 times each year. Generally, it is a 4-hour morning project followed by lunch in the office. Also, generally, we are all on the same project at the same time. The Gathering’s split project days is new because they have a new location that could not accommodate us all at once.
In addition to the Q1, Q2, and Q3 service projects, you are each allotted 4 hours of time that you are free to use at any point in the calendar year. Be sure to check with your supervisor beforehand if the project will be on a workday, so they can know for scheduling purposes. These FOUR hours can be used all at once or piecemeal throughout the year.
If you need/want ideas, Angela came up with a few lists a couple of years ago. They haven’t been reviewed the web links since, so if they are not working anymore or are not useful, please let Angela know and she's edit the document:

If you still don’t know how to use your time, and would like me to just plan something for you, let’s chat. Another idea is to make a smaller group with some of your co-workers and find a project together.

If you have any other questions about volunteering, let Angela know!