High Quality Content by WIKIPEDIA articles! The first heats of the Women`s 100 m Butterfly took place on the morning of Sunday, 26 July. The semi-final took place in the evening session of 26 July and the final took place on the evening of the 27 July at the Foro Italico in Rome, Italy. In the final, 7 of the 8 swimmers finished within the same second, and 5 within the same 0.1 of a second.