then, in the first case, any person entitled to be a petitioner in respect of the election to which the petition relates may, and in the second case the Registrar shall, give notice by publication in the Gazette, and in a newspaper published in Saint Lucia of such event having taken place, and within 21 days after publication of the notice in the Gazette, any such person may apply by summons to the Court or a judge to be admitted as a respondent to oppose the petition, and such person shall be admitted accordingly either with the respondent, if there be a respondent, or in place of the respondent.