They are expecting over 10,000 visitors attending the event.
Then on October 22nd is the Grand Opening of the new Church of Scientology of London!

This is a photo of the event in 1993 when David Miscavige announced that the IRS had given the Church of Scientology International, the Church of Spiritual Technology (CST) and all Scientology churches in the US full tax exemption, which was the last hurdle in the Church being recognized as a religion in the US.