Eighteen mosques across Massachusetts are taking part in the third annual "Open Mosque Day.''
Supporters of the Sunday event say it's meant to give members of the public a chance to meet their Muslim neighbors.
CAIR-Massachusetts and the Islamic Council of New England say visitors will have a chance to tour a mosque, hear a brief introduction to Islam, and observe a Muslim prayer service.
Martin Bentz, the event's organizer, says inviting neighbors in to see what a mosque looks like helps to break down walls between groups.
The open mosque events will generally take place between 3 and 6 p.m.
Participating mosques are located across the state, including in Boston, Cambridge, Worcester, Framingham, Chelmsford, Lynn, Hadley, Quincy, Sharon, Dartmouth, Wayland, Medford, Chelsea, Haverhill, West Springfield, and Malden.