Getting to Maishima Sports Island (Osaka gigantic music festival)

Hi guys!

I’m planning to go to the Osaka gigantic music festival on 20th July 2024 but am unable to get a shuttle bus ticket as I’m a foreigner living outside of Japan.

Would like to check if it would be possible to get in and out of the venue by taxi, and if there are public buses entering/leaving the venue on the day of the event?

Thanks for the help!