Welcome householdrob !
Since "Lost City" is a Numa Files book by Kemprecos, I doubt very much if there will be a book signing tour by Clive. However there's talk of a tour for Dirk Cussler's up-coming book, "Black Wind". As soon as details come to hand you can be sure that the info will be posted here.
Cheers ... B)
The only tour info we have so far is on this topic ;
http://s4.invisionfree.com/CLIVE_CUSSLER/i...ndpost&p=415629