High Quality Content by WIKIPEDIA articles! The 2011 Isle of Man TT Festival were held between Monday 30 May and Friday 10 June 2011 on the 37.733-mile Mountain Course in the Isle of Man. The main celebration for the 2011 Isle of Man TT Races the Milestones of the Mountain Course special parade lap held on 10 June 2011 to commemorate the centenary of the Snaefell Mountain Course included the former FIM World Champions Giacomo Agostini and Phil Read. The 2011 Isle of Man TT Festival also included the Pre-TT Classic Races on 27, 28 & 30 May 2011 and the Post-TT Races on 11 June 2011 and both events held on the Billown Circuit.