Iheartradio Festival 2025. The south by southwest festival, held annually in austin, texas, will launch a european edition in london in june 2025. By technadu staff / september 22, 2023.

The iheartradio music festival 2023 starts friday, september 22 and wraps up on saturday, september 23, 2023, in las vegas, nevada. Sxsw london will feature the mix of.