I heard somewhere that going to a Bris will have all of your sins forgiven because of the following story:
Hashem told Eliyahu HaNavi that he'd have to go to every Bris. Eliyahu responded, "what if the father of the baby is a sinner?"
"I'll forgive him for his sins," said Hashem.
"What if the Mohel or Sandek is a sinner?"
"I'll forgive them for their sins."
"What if the people attending are sinners?"
"I'll forgive them for there sins as well," answered Hashem.
I'm looking for a source for this story.