Cloudy today with a high of 72. More rain expected tomorrow. It’s back to school in New York City today — and back to business for community groups that had gone on hiatus over spring break and the holidays. This afternoon, Community Board 3 and city agencies hold an open house; it’s an opportunity for residents to have look at 3D models of the Seward Park redevelopment site and to offer feedback. Also, CB3’s full board meets tonight. And it’s the monthly meeting of the 5th Precinct Community Council. Check out our Calendar for detailed info on these events and more.