Join the Mattapan Community Health Center in celebrating its first year in its new home in Mattapan Square. An opening celebration begins at 10 a.m with light refreshments. Door prize to the first 25 people. All day: free giveaways, raffles, health insurance, free HIV/AIDS testing and more. To attend the closing celebration at 5 p.m., please RSVP to 617-898-9049.