A Sheldon Convention can refer to 1 of 2 things:
1. The meeting of millions of hot women to have sex with each other in front of Sheldon.
2. The meeting of millions of Sheldon's. Every Sheldon is repeating the phrase, "WOMAN, WHERE'S MA SAMICH?!?"
Note: Ma Samich = My Sandwich
1. This Sheldon Convention is awesome, look at all these women!
2. Man there are so many Sheldon's here, this must be a Sheldon Convention...WOMAN, WHERE'S MA SAMICH?!?