In "The Minister's Black Veil," how does the veil affect the wedding?

Weddings are supposed to be joyous family
occasions. There is always a sense of happiness for the newly wedded couple as well as a
positive and hopeful outlook on the new couple's future together. To put it bluntly, Mr.
Hooper's black veil ruins all of those feelings.

What makes it worse is that
the text tells readers that Mr. Hooper has always previously been a bright and cheery person at
weddings. He is the kind of person whose very presence calms and encourages the nervous couple
while at the same time conveying a general cheerfulness to all the wedding's
attendees:

That night, the handsomest couple in Milford
village were to be joined in wedlock. Though reckoned a melancholy man, Mr. Hooper had a placid
cheerfulness for such occasions, which often excited a sympathetic smile where livelier
merriment would have been thrown away. There was no quality of his disposition which made him
more beloved than this.

When Mr. Hooper shows up at the
wedding, he does not usher in the standard happy wedding feelings. Instead, readers are told
that Mr. Hooper brings in an overall sense of evil:

When Mr. Hooper came, the first thing that their eyes rested on was
the same horrible black veil, which had added deeper gloom to the funeral, and could portend
nothing but evil to the wedding.

We are told that the
people in attendance feel as if the room has grown darker. The bride becomes so pale that people
think that she looks like the dead body from the day's earlier funeral. We are specifically told
that Mr. Hooper's black veil creates one of the most "dismal" weddings
ever.