Many many years ago before I got married i davened for a long list of people in need of shidduchim cause of the famous saying “that when a person Davens for someone then the person davening for him gets answered first” now many years later since I was benched to get married I didn’t stop davening for others to find shidduchim but am still davening for them today.
On your other point. It’s because today with so many weddings and other Simchas people need to stop into to give Mazel tov. They don’t have time to spend long at each Simcha so their making sure to give the Chosson or parent a hearty Mazel tov and then have to leave EVEN THOUGH THEY REGISTERED TO STAY FOR THE ENTIRE NIGHT. Not to hurt the baal Simchas feeling.
As a final message of you mentioning that you need every person’s bracha. My personal to you is-from an older person-
Is to turn Directly to Hashem with heartfelt Tefillos for whatever you need-rather its a Shidduch or livlihood or something else etc…..-as we say at the end of benching from Tehillim. Vdorshei Hashem….. which means for one that seeks out Hashem DIRECTLY lacks nothing that is good.
May Hashem help you find your zivvug quickly cause in truth we all know s/he’s already waiting for you since 40 days before you were even born. That’s besides the fact that now your at least 20 to 25 years later since being born.