Bradshaw was unhappy at being shopped around at the end of the 2009 season as Brisbane sought to trade for Carlton's Brendan Fevola.
The 12-year Lion ended up at the Sydney Swans for the final two seasons of his career, but was not pleased with former teammate and then coach Michael Voss.
However, he will return to the club for the 'back-to-back-to-back' luncheon at the Brisbane Convention and Exhibition Centre – his first involvement with a Lions function since he headed south.
Bradshaw will be joined by former teammate Jason Akermanis who departed at the end of 2006, also on bad terms with the club.
'Aker' has been back since though, going to the 10-year reunion of the 2001 flag, two years ago.
Fullback Mal Michael is the only player from the 2001-2003 premiership teams unable to attend, due to work commitments.
As well as current Lions coach Voss, fellow senior coaches Brad Scott (North Melbourne) and Chris Scott (Geelong) will interrupt their round one preparations to attend the lunch.
Gold Coast staff members Marcus Ashcroft and Shaun Hart will also be there, along with the entire Lions’ NAB-Cup winning squad.
The event will be broken into three parts to celebrate each flag.
Alastair Lynch (2001), Jonathan Brown (2002) and Simon Black (2003) will feature in three video packages, with each player providing a first-hand recount of their team’s march to the premiership.
The packed event is expected to house 1200 people.
Michael Whiting covers Brisbane Lions news for AFL.com.au. Follow him on Twitter: @AFL_mikewhiting