A participant in a major episode of the Civil Rights era and a veteran television journalist will give leactures at Wheaton College that are open to the community. At 6 p.m. on Feb. 24, New Bedford resident Jibreel Khazan, formerly Ezell Blair Jr., will speak about his experiences as one of the four University of North Carolina students, known as the Greensboro Four, who staged the original sit-in at the Woolworth’s lunch counter to protest unequal treatment of African-Americans. The lecture is “a once in a lifetime opportunity to meet and hear from one of four students who took action because they believed in equality,” Associate Dean Denyse Wilhelm said in an e-mail. His appearance follows a lecture by Liz Walker, an award-winning news anchor and ordained minister now working in Sudan, who will appear at 7 p.m. this Thursday. “We were looking for a speaker who could tie together domestic and global issues in an inspiring way,” said Associate Dean Raquel Ramos.