Philadelphia 76ers partner Michael Rubin has the likes of Kevin Hart, Meek Mill, Justin Bieber and Magic Johnson backing his amazing plan to raise money for COVID-19 relief.
Rubin launched the "All In Challenge" Tuesday -- it's a massive fundraiser to feed Americans affected by the coronavirus pandemic ... and it's offering once-in-a-lifetime fan experiences in hopes of raising tens of millions of dollars.
People who want to donate to a great cause can throw down as little as $10 to enter to win awesome prizes .