70. When the notice of hearing has been sent to the complainant in accordance with section 68, if he is not present or represented by an advocate at the hearing and has not advised the secretary of the section that he cannot be present or represented, the Board shall dismiss the complaint.
In such case, upon a written request of the complainant handed or addressed to the secretary within fifteen days following the mailing of the notice provided for in section 71, the Board may, for sufficient cause, relieve the complainant of his default, set aside the decision and resume the hearing upon notice to the complainant in accordance with section 68.
1971, c. 50, s. 71; 1972, c. 46, s. 16; 1973, c. 31, s. 36; 1975, c. 68, s. 28.