A community is a small or large social unit (a group of people) who have something in common. An event may refer to: gatherings of people, for example in science, or in arts and entertainment; an event can also celebrate unique aspects of a community.
A written statement that tells people about something. Announcements can be made for reasons such as the introduction of a new product or practice.
A volunteer is person who does something, especially helping other people, willingly and without being forced or paid to do it: it can and usually be done through or for a charity organization.