NixFifty Calendar 2.5.1

Calendar, as the name suggests, is a full-fledged calendar and events management system.
Features:
Allow users to create new events in configurable 'calendars'. Custom permissions allow you greater control over who can see a event.
Calendars can be customised so different calendars can have different coloured events, for example.
Optional agenda-based layouts.
Style properties available to fine-tune Calendar appearance.
Support for featured events that display above the calendar.
Event creation that fully controlled by the permission system.
Support for all-day events and multiple day ones too.
Support for recurring events and a number of options to fine tune how often they recur.
Support for RSVP with limited and unlimited number of attendees.
Users are then able to view a guest list of who is attending, might be attending and not attending.
Users that RSVP or watch events will be notified when key event details change.
Attendees can be reminded when an event start date is approaching.
Ability to view a list of attendees and non-attendees.
Users are able to invite others to RSVP to events.
Users are able to add events to their own personal calendar apps via .ICS files.
Events can generate associated discussion threads on creation.
Locations can be attached to events, letting you pull in mapping information from Google's APIs.
If enabled, locations can be auto-completed using Google's Places API.
Events can be filtered based on location and how far away they are.
Custom fields are fully integrated within the add-on letting you capture custom data for different Calendars and display the data in a variety of locations.
Integration with XenForo core functionality.
End users receive alerts and emails when others RSVP to their events with appropriate opt-outs.
Support for content tagging.
Support for content watching.
Support for attachments.
Support for inline moderation.
Supprt for moderation queue and moderated events.
Ability to search for events based on criteria.