Is it possible to make a plan to be spontaneous?

I’ve never had a problem being spontaneous before but the more I enmesh myself in a project (or projects) the less I find I do the unexpected things. Usually the “something new” is an unplanned activity, some whim that turns into an adventure. So that’s the paradox—all these “to do” items make it potentially less likely I’ll fit the spontaneous “something new” in.

Unless I work it into my plan. Hmmm.