8
xcGall can send e-cards using the photos in the gallery. Full permission set, so you can control which user-groups are able to use the facility. The e-cards are sent to the recipient by email and there's a back-link to your site's gallery included in the email.
As for a calendar, try ExtCal (
http://www.zoullou.net/). This appointments/events have Who's Going/Who's Not Going listings for each event/appointment. Again the module has a very full permisison set to control who has access to what.
Both are fine modules but, as with any modules, you need to try them to see for yourself
