You should be able to get there for a lot less than f.436, Michel.
I paid about f.200 for a return flight with Air France, last month.
A lot of airline companies have special offers from time to time,
you just got to get lucky. If you are serious about attending the
party on sunday, you should just call a couple of travel agencies
or visit the websites of a few airline companies... you never know
what's on 'sale'. I'll be trying to attend the party myself, if I'm not
bogged down in work, so if I learn of any 'great deals' I'll let you