The Eucharistic Prayer during Mass has always been the occasion for powerful encounters for me. When I altar serve (or have done, since my current parish doesn't make room for adult servers) it is always with great difficulty that I don't pass out. Of course that could be the acrylic talking, as in the hot robes, but I never experience that anywhere else. Some of my best revelations/conversations with God happen then, even when I am completely focused.
Today was Nico's turn. Right in the middle, just before the Epiklesis, he whispered to me, "Look, Mommy, here they come." He waves his hand in the air in an arc above the altar. "They're here," he said, "the Angels." I repeated, in our custom, "They're here, the Angels." He was pleased, and hugged me close.
They're here, the Angels.