Hamptons Doc Fest & Southampton Arts Center celebrate with a keynote discussion and film screening of “San Juan Hill: Manhattan’s Lost Neighborhood,” (2024, not rated, 1:00) a documentary directed by Stanley Nelson, a Q&A follows online with Stanley Nelson, 4-6 p.m,. Southampton Arts Center, 25 Jobs Lane, $15, reserve, southamptonartscenter.org, 631-283-0967.