Which preposition to use with ingatherings

of Occurrences 7%

Throughout August, during the ingathering of the harvest, a host of customs have been kept up from time immemorial, which have been duly noticed by Brand, while towards the close of the month we are reminded of St. Bartholomew's Day by the gaudy sunflower, which has been nicknamed St. Bartholomew's star, the term "star" having been often used "as an emblematical representation of brilliant virtues or any sign of admiration."

Which preposition to use with  ingatherings