Addition to the above: I guess you have to make arrangements with the tracker FIRST, before creating the torrent. But you probably already know that.
It's not a question of "converting" your files to "torrent format." The torrent file you make contains information about the tracker being used, and enough information about the files being shared so that each BitTorrent program can verify their authenticity. So the torrent file is like a 'key' that allows each user who has it to participate in the file sharing.
Looking forward to hearing your concert....
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