Newsletter
The first mention is the purpose in one paragraph, the target and the date. The second mention is the ways to give, with the year-end deadline for each (online, by post, stock, the Sunday itself). The last call is the target, the amount given so far if the church reports it, and the ways to give.
Social
Save the date is the purpose and the date. The reminder post the Friday before is the ways to give with the online link. The day-of post is the purpose again, with the link, posted after the service.
Sunday Announcements
Announce it two Sundays before with the purpose and the target. The final announcement on the day is the purpose, the ways to give, and the deadline for gifts to count in the year.
Website
One page: the purpose, the target, the breakdown of what the money does, every way to give with its year-end deadline, and the church's giving statement policy. Published four weeks out and updated with the running total if the church reports one.
Print
A giving card in the seat backs with the purpose and the online address, and the purpose on the lobby screens. Due a week before.