Which preposition to use with solemnization

of Occurrences 10%

To divert them, she turned to gaze on a long procession of illuminated gondolas, from which she heard a strain of plaintive music, as if of prayers for the dead, A dreadful presentiment seized her heart; she inquired the purpose of the procession, and heard, with unspeakable terror, that it was the solemnization of the funeral rites of a Venetian nobleman, who had been beheaded for high treason.

Which preposition to use with  solemnization