I have noticed a custom among wedding-goers to receive blessings from the bride and the groom at weddings, usually when they come over to the new couple's table for well-wishing during the meal. Why is this done specifically at weddings? I have never seen such a custom elsewhere.
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Rabbi Chaim Fuchs Shlita writes as follows.
It is mentioned in the name of Radomsker Rabbi Zatzal that when he heard that the Tchetcheniv Rabbi Zatzal got sick, he said that the Arizal says that it says in the Zemiros of Friday night "LeOris V'Arusa L'Hitakfa Chalashin" indicates that at a wedding is an opportune time to effect for one that is ill.
Therefore the Minhag became to request a Bracha from the Chasan and Kallah to pray for those that are ill or single on the day of their wedding, when they are forgiven for their sins, and they are considered Tzadikim.
In addition the Bracha of a Chasan and kallah is effective for Parnasa when they bless together, since the words "חתן וכלה" equals the two names which are opportune for Parnasa "פא״י חת״ך" which are the beginning and ending letters of "פותח את ידיך" and "חת״ך" is also the ending letters of "והיית אך שמח" thus both because of the Simcha of the Chasan and Kallah + the Bracha of the Chasan and Kallah.
I suspect (but have no source for claiming) that it may be a corruption of one of these traditions, cited in Nit'e Gavriel (Nisuin volume 1):
On their wedding night, God forgives the bride and groom for all their sins. Therefore, people go over to them to get a blessing, as you are getting a blessing from someone who has no sins (similar to someone going over to a Rabbi or Tzadik to ask for a blessing, and Tzadik Gozer V'Hakadosh Baruch Hu Mikayem (lit. A righteous man decrees and God fulfills)). Since the bride and groom (hopefully) have no sins yet (having just been forgiven), they fall under the category of Tzadik.
Similarly, the prayers of children are said to have the same effect, since children are pure and free of sin (until the age of Bar or Bat Mitzvah).
Unfortunately, I don't know the sources off the top of my head and I don't have the time to look it up. If I happen to remember where it is (or someone else points it out), I'll edit it in later.