Children aren't usually allowed on the NYSE floor, but given e.l.f's ... either during the ringing of the opening trading bell or when they take the gavel to the bell that opens their own company.
The NYSE was known for centuries as the "Big Board" because brokers would use an auction-based system to buy or sell shares of stock from its trading floor, and share prices were updated ...
Another part of the ceremony is the gavel used to ring the bell ... Children aren't usually allowed on the NYSE floor during typical trading days, but IPOs are an exception.