Classical Music Concert in SL wants RL Names

While I like the idea of the Royal Liverpool Philharmonic orchestra wanting to do a live concert in SL, see

http://www.liverpoolphil.com/content/homepagefeatures/SecondLife.aspx

I am doubtful as to why they want RL names to register for a free entrance ticket. This is being asked by 'WhatistheMetaverse.com'

http://www.whatisthemetaverse.com/RLPO1.html

who want name, address, d.o.b. and

"Second Life Avatar name (if unknown, leave blank)"

Has this approach been done before?