More than a handful of buildings across Boston will be lit up in rainbow colors Monday and Tuesday in honor of Mel King, a longtime city activist and former state representative who died March 28 at age 94.

City Hall, the Bruce C. Bolling Municipal Building, Center Plaza, One Financial Center are among the participating venues, while other details on how the city will remember King were released on Friday.

Mayor Michelle Wu is set to read a proclamation during a wreath-laying ceremony at City Hall Monday at noon declaring Tuesday as a citywide day of remembrance for King.

A public viewing and visitation will be held Monday from 4 to 8 p.m. at Union United Methodist Church, 485 Columbus Ave., with an opportunity for “witnesses from the community” from 6:30 p.m. to 7:30 p.m.

The funeral also will be held at Union United Methodist Church in the South End, on Tuesday at noon. King’s family has invited guests to don bow ties “as a tribute to Mr. King.” Boston Arts Academy students will be performing a tribute.

Tickets for the funeral sold out Friday within hours of being made available to the public on a first-come, first-served basis.

Community members can sign a condolence book paying tribute to King at City Hall and the Bolling Municipal Building, beginning Monday at noon and lasting until 5 p.m. Tuesday. Flags on City Hall Plaza will be at half-staff until sunset Tuesday.

King was a trailblazing advocate and political activist. He ran three times for a seat on the Boston School Committee, in 1961, 63 and 65,  losing each time, but he won a seat in the legislature, serving as state representative from 1973 to 1982.

In 1983, King ran for mayor, becoming the first Black candidate to advance to the final election in Boston. He ultimately lost to Ray Flynn, but his campaign gave rise to the Rainbow Coalition, a political model subsequently used by Jesse Jackson in his run for president, according a History Makers biography of King.

State House News Service contributed to this report