Based on the search results, it is not clear which concert is happening at Ruoff tonight. However, there are several concerts scheduled for September 23, 2023, at Ruoff Music Center in Noblesville, Indiana. These include:

• Jason Aldean: High Desperado Tour 2023
• Willie Nelson & Family / Neil Young / John Mellencamp / Dave Matthews: Farm Aid
• Jelly Roll: Backroad Baptism Tour 2023

It is recommended to check the official website of Ruoff Music Center or Ticketmaster for the most up-to-date information on concerts and events happening at the venue.