Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Google Calendar - Spend less time managing your day & more time enjoying it
Raft Calendar - A fun and beautiful calendar for couples and close friends
CalendarZ - CalendarZ is a simple yet high-level calendar application, introduced lots of advanced functions and features.
emble - Plan better events with your friends
CalenGoo - Features | 1.0.175 for Android™