Hi Shari,
For this, I think it would be more useful to use tags. In admin, create a tag called "Program Creator" and enter the names of your active users and make this tag required for all newly created programs. Then, you can filter your calendar by the Program Creator tag.
Here are some links:
Create Custom Tags - https://community.marketo.com/MarketoTutorial?id=kA250000000Kyp0CAC
Filtering Marketing Calendar - https://community.marketo.com/MarketoArticle?id=kA050000000LNCYCA4