I do not think it is fair to advertise a New Years Eve Dance Washington DC as the best one around when that can not be proved as a factual statement.  Whether or not it is the best ever is solely a matter of one's opintion.  Parties and dances are events that are meant to be enjoyable by all who attend them.  What makes them great is the entertainment, refreshments, company, and atmosphere.  If the people in attendance do not enjoy these things, the party can not be considered the best one around.

Likewise, the level of fun to be had at a particular Professionals in the City event depends on two factors:  how the event is conducted and who is there.  Some would consider a meal of roast duck or lamb to be very upscale and appeasing.  Of course, if the diners are vegetarians, they will leave the dinner hungry and offended.  The same comparison can be made about other things.  Christian people in their twenties may enjoy mainstream heavy metal, pop, and rap music however Christians from the Baby Boomer era probably do not even consider that noise to be music.  Therefore, the "best" things are merely matters of opinion that are directly dependent on who's opinion you are asking.

Similarly, we can say that two thirty year old single Jewish men attend a Jewish New Years Eve Dance Washington DC gala for men and women of all ages.  Let us say that there are one hundred single Jewish women in attendance, and eighty percent of them are over the age of thirty.  For one of the Jewish men, this is great because he prefers to date women who are older than him.  Subsequently, he gets to dance with five of them, leaves with two phone numbers, and feels like he really enjoyed the party.  The other Jewish man was highly allergic to the perfume of the young woman whom he asked to dance, so he spent most of the night wiping his nose and sneezing.  That is not to say either way whether or not the party was the best or worst.