Thanks to Bren for the information. Tickets for the concert at the Palais de la Musique in Strasbourg are available from Wolf Musique, by phone (+33 (0)3 88 324 310). Ticket prices range from 41 EUR to 77 EUR. If you don’t speak French, try contacting them using the email address found on their Web site.
Thanks to Colm for the information (originally from serious.org.uk). Keith Jarrett, Gary Peacock, and Jack DeJohnette will play at the Royal Festival Hall on July 25, 2009. Tickets will go on sale on Wednesday, May 27 at 10 AM. They should be available online from Southbank Centre.
Tickets for the October 12, 2009 solo concert at the Philharmonie in Berlin will go on sale on Tuesday, May 19, 2009 (the day after the solo concert in Naples). They will be available online from Karsten Jahnke (among others?). Tickets will cost from 70.50 EUR to 137 EUR.
If you have any information about the concert at the Palazzo del Te in Mantua (box office address, ticket sale date, etc.), please let me know.