In all cases in which, before the effective date of this Act, the regional superintendent of schools was required to publish notice of a referendum to establish a community unit school district in territory comprising 2 community unit school districts, 2 community consolidated school districts, and 2 community high school districts and such notice was not published by the regional superintendent of schools as required by Section 11A-5 of the School Code (now repealed) and a majority of the voters residing in each of the school districts comprising the proposed community unit school district voted in favor of the creation of such community unit school district in the general election held on November 8, 1994, and in which territory at a subsequent election similarly called and held a board of education has been chosen for such district, each such election is hereby made legal and valid and such territory is hereby declared legally and validly organized and established as a community unit school district, and a valid and existing school district.