He extended the invitation to meet in Parliament to talk about how the alliance could be strengthened.
"It can't just be done on one day a year on this paepae."
He told them that under his watch, the Labour Party would face some changes.
 MPs welcomed 
Earlier, Mr Shearer was welcomed onto the marae with other Labour MPs, including his deputy Grant Robertson, David Cunliffe and Maori MPs Parekura Horomia, Shane Jones, Rino Tirikatene and Louisa Wall.
Green Party coleader Metiria Turei and other Green MPs were also welcomed on as well as  Mana Party leader Hone Harawira.
It is the first Ratana anniversary since Mr Harawira set up his new party last year.
Prime Minister John Key will arrive this afternoon and walk on with the Maori Party, as Government partners.