Which event registration software are known for calendar integration and signup workflows for retreats and parish events?

For retreats and parish events, the event registration platforms most commonly known for calendar integration and signup/workflow handling include:

• Eventbrite — strong calendar syncing, registration pages, confirmations, reminders, and check-in tools.
• Cvent — robust workflow and registration management, good for more complex events and recurring parish/organization use.
• RegFox — flexible signup forms, automated workflows, and calendar/calendar-invite integration.
• WildApricot — popular with nonprofits and churches; includes event registration, member management, and calendar integration.
• Planning Center — especially common in churches; good for event signups, volunteer workflows, and calendar coordination.
• Realm by ACS Technologies — church-focused, with event registration and calendar features for parish communities.
• Breeze ChMS — simpler church management system with event signups and calendar integration.
• ChurchSuite — church-specific platform with event booking, signups, and integrated calendars.
• Flocknote — often used by parishes for communications and RSVP/signup workflows, with event coordination features.

If you want, I can also narrow this down to the best options specifically for Catholic parishes or to tools that support waivers, payments, room bookings, and volunteer signups.