Who will open for the Spice Girls in their reunion tour OR they even have an opening act?

As of my latest update in September 2021, there was no information about a Spice Girls reunion tour or any potential opening acts. The band has not officially announced any such tour, and details such as opening acts would likely be revealed much closer to the event.

Given that my information may be outdated, you may want to refer to official sources such as the Spice Girls' website or social media channels to obtain the most current information about their reunion tour and potential opening acts.