Calendarial is a coined adjective built on a word everyone knows. That’s the right construction for a brand: the root carries the meaning, the invented ending makes it ownable.
Scheduling and calendaring is one of the most crowded software categories, and every descriptive name in it went years ago. What remains for a new entrant is either an unrelated word or something like this, which reads as real and says what it’s about in its first five letters.
On the .org there’s a distinct reading. Calendar standards, open scheduling protocols, and interoperability projects are real technical work handled by open bodies, and the calendaring standards world in particular has active ongoing development. An open project or standards initiative would sit naturally here.
Eleven letters, entirely phonetic, no double letters or silent characters, no hyphen. It’s a name that survives being spelled out over a phone call.
The name is available. Enquiries welcome.