You searched for: “agendum
agendum (s) (noun), agenda (pl)
Things to be done, memoranda of items to be considered at a meeting. Agenda was plural in form in the original Latin, but now is often used as a singular in English, in the sense of "list"; and followed by a singular verb.

So well established is agenda as a singular that agendas is now commonly heard and seen as the plural form; however, the correct Latin singular is agendum; as, "The agendum is whether we want an extended school year or not."

"The agenda have been established for the meeting."

You have the choice to follow hoi polloi or to write it "correctly".