Answer by taking a quote from the following article:

Evers was born July 2, 1925, in Decatur, Mississippi, the third of the five children (including older brother Charles Evers) of Jesse (Wright) and James Evers. The family included Jesse's two children from a previous marriage. The Evers family owned a small farm and James also worked at a sawmill. Evers walked twelve miles to attend segregated schools, eventually earning his high school diploma.

The couple moved to Mound Bayou, Mississippi, a town developed by African Americans, where Evers became a salesman for T. R. M. Howard's Magnolia Mutual Life Insurance Company. Howard was also president of the Regional Council of Negro Leadership (RCNL), which began to organize actions for civil rights; Evers helped organize the RCNL's boycott of gasoline stations that denied blacks the use of the stations' restrooms. Evers and his brother Charles also attended the RCNL's annual conferences in Mound Bayou between 1952 and 1954, which drew crowds of ten thousand or more.  In 1954, following the U.S. Supreme Court decision that segregated public schools were unconstitutional, Evers applied to the state-supported University of Mississippi Law School, but his application was rejected because of his race. He submitted his application as part of a test case by the NAACP.  On November 24, 1954, Evers was named as the NAACP's first field secretary for Mississippi. In this position, he helped organize boycotts and set up new local chapters of the NAACP. He was involved with James Meredith's efforts to enroll in the University of Mississippi in the early 1960s.  Evers also encouraged Dr. Gilbert Mason Sr. in his organizing the Biloxi wade-ins from 1959 to 1963, protests against segregation of the city's public beaches on the Mississippi Gulf Coast. Evers conducted actions to help integrate Jackson's privately owned buses and tried to integrate the public parks. He led voter registration drives, and used boycotts to integrate Leake County schools and the Mississippi State Fair.  Evers's civil rights leadership, along with his investigative work, made him a target of white supremacists. Following the Brown v. Board of Education decision, local whites founded the White Citizens' Council in Mississippi, and numerous local chapters were started, to resist the integration of schools and facilities. In the weeks before Evers was killed, he encountered new levels of hostility. His public investigations into the 1955 lynching of teenager Emmett Till and his vocal support of Clyde Kennard had made him a prominent black leader. On May 28, 1963, a Molotov cocktail was thrown into the carport of his home. On June 7, 1963, Evers was nearly run down by a car after he came out of the NAACP office in Jackson.

what else did they do for the group
Evers and his brother Charles also attended the RCNL's annual conferences in Mound Bayou