It seems to be a tradition that business partnerships and operating agreements 1. Don’t ever get reviewed, or 2.They get reviewed once a year at the same time.
Instead, review your partnership agreements every fifteen months. Why? Because it will break you away from the influences of seasonality. Your business may be different in the winter than it is in the summer. (And that means you will look at your agreements differently.)
Shake things up by design. Every fifteen months is one way.