Pick a date for the friend you keep promising to catch up with eventually. Eventually has no square on the calendar grid.

Eventually is not a time. Every unscheduled intention lives in a permanent future tense where nothing has to happen, and the friendship runs quietly on the assumption that there will always be more room later. Nothing hostile is going on. People are busy, and the calendar fills with things that have dates attached, which is exactly the point.

Open the calendar now and put a day on it, even one six weeks out. Send a message with a specific proposal rather than a vague one, since vague ones are how this happens. If they cannot make it, pick another day right then instead of returning the whole thing to eventually.