Re: Will Future/Future continuous/Future perfect
This is how I see it (omitting "one day", which does indeed interfere with the future perfect, and adding "in August 2009" for clarity).
Let xxx = the period of playing in a band; H, the manager hearing me play and asking me to make a record:
1. In August 2009, I'LL BE PLAYING in a band, here in Liverpool. A famous manager WILL HAVE HEARD me play, and WILL HAVE ASKED me to make a record.
2. In August 2009, I'LL BE PLAYING in a band, here in Liverpool. A famous manager WILL HEAR me play, and WILL ASK me to make a record.
(Thus both are possible; but the future perfect looks back on the "hearing and asking", from the point of view of August 2009, while the ordinary future suggests that the "hearing and asking" occurred around August 2009.)
All the best,
Not a professional ESL teacher.