The Maine Department of Economic and Community Development has updated their checklists for large gatherings, including weddings.
Currently, venues can hold 50 percent capacity indoors and 75 percent capacity outdoors. However, as of May 24, those limits increase to 75 percent and 100 percent, respectively.
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All checklists do encourage attendees to wear masks and stay physically distant whenever possible.
People in a shared space must be able to maintain 6 feet of physical distance from individuals outside of their household group/travel party. If a space cannot accommodate individuals maintaining 6 feet of physical distance, further restrict the number of individuals allowed in that space beyond the limits established by Executive Order.
You can see all the checklists and guidance information here.