Indiana Code Title 16. Health § 16-41-22-5

Sec. 5. A person may not:

an actual or a reasonably anticipated assembly of at least five thousand (5,000) people that continues or can reasonably be expected to continue for at least eighteen (18) consecutive hours, whether on public or private property, unless a license to hold the assembly has first been issued by the appropriate law enforcement official of the unit in which the assembly is to gather.  A license to hold an assembly issued to one (1) person permits any person to engage in any lawful activity in connection with the holding of the licensed assembly.