Newsletter
The first mention gives the date, the time and the length of the service, and says what kind of service it is: a reading service, a communion service, a service with music. The second mention adds whether children attend and what is provided if they do not. The last call, the Thursday before, is the time and the address in two lines, placed above Easter's own copy.
Social
Save the date is the time, on an image that is visibly different from the Easter image so the two are not confused. The reminder post the Friday before gives the time and the length. The day-of post goes out in the morning with the time repeated, since the service is in the evening at most churches.
Sunday Announcements
Announce it two Sundays before, with the time and the length. The final announcement is the Sunday before the service, because the Sunday after it is Easter; this is the pull-back the schedule applies to any event that is not on a Sunday.
Website
One page for Good Friday and Easter together, with Good Friday listed first until it has happened. Time, length, address, what kind of service, whether there is childcare. Published four weeks out.
Print
A line on the Easter poster and the Easter card rather than a poster of its own: the Friday time under the Sunday times. Print is due a week before it goes up.