"Will the trip to Crete materialize next April?"
It is on the planned list of NG Events, yes. Probably a bit early to do the location and accommodation research yet, but don't procrastinate.
Once there is a time table and some kind of plans for where to stay, including a price estimate, the official announcement can be made for NG members to sign up. I usually book air flights at least 3 months in advance to get a fair price, so getting the date(s) is very important.