Saturday evening kids birthday party??

Ctr

So my oldest is turning 8 early next year and decided she wants to have her party at this indoor playground. We are leaning towards renting out the entire place in order to avoid the crowds and bustle of the weekend morning/afternoon party people. The place offers private rentals from 6pm for 2 or 3 hours on any night of the week. We were thinking of having her party on a Saturday from 6 - 8 or 9pm. It’s a significant extra cost to rent the entire place, so I am kind of hesitant since I don’t know if parents would be willing to bring their kids to a party at that time. On the plus side, it’s a flat fee, and she can invite as many people as she wants with no charges for extra kids. What do you all think? Is it too late in the day to have a party?