After Bihar Chief Minister Nitish Kumar said that he did not need a visa to go to Mumbai, Maharashtra Navnirman Sena (MNS) chief Raj Thackeray has dared him to visit the city."Let us see how he (Nitish) celebrates Bihar Din in Mumbai. I don't want to play any politics here...everything was fine and calm, what was the need? Bihar Din was celebrated on 22nd March and now you want to celebrate it on the 15th," Mr Thackeray said on Thursday during a rally at the Idgah maidan in the powerloom town of Malegaon.