Our Lady of Perpetual Help Roman Catholic Parish issued the following announcement on June 21

Returning to our series on the Mass, we have come to one of the most meaningful moments. It is called the EPICLESIS. During the EPICLESIS the priest prays not only with his voice, but also with a gesture his hands make as he lifts them (palms down) high, and lowers them slowly with a downward motion calling down the Holy Spirit over the gifts of bread and wine we have brought, that they may become the Body and Blood of our Lord Jesus Christ. An altar server rings the bell as if to say, Wake up! Pay attention! Something sacred is happening in the invisible world!

As the priest prays, we ask the Holy Spirit to come down into our hearts, to dwell in our bodies that have become his tabernacle and to make Christ present in us like He did with Mary.

Use your imagination to picture the fire of the Holy Spirit falling on the gifts of bread and wine at the Epiclesis.

Original source can be found here.