Travelling to Nice is cheap
Same price as London from East coast (minimum around 500 USD).
From 700 USD from the West coast.
Direct flight from New-York to Nice with Delta in 6 hours.
From West coast, direct flight to London (10 hours) or Paris (11 hours with Air France (SFO), AOM (LAX), or United(SFO)).
Extra cost for flying to Nice from European main hubs is from zero to 100 dollars (depending on the airline).
Travelling to Nice does not take all that long
London to Nice: 2 hours (5 flights per day).
Paris to Nice: 1 1/2 hour (25 flights per day).
Connecting time in Paris with Air France, American, United, Delta, TWA, Tower, Continental: 45 minutes.
You can also fly through Brussels, Geneva, Amsterdam, Frankfurt, Milano, Madrid, ...
From Nice to Cannes (30 km), you can take a bus (10 USD; 45 minutes),
a shuttle (40 USD; 30 minutes), or a helicopter (80 USD; less than 10 minutes).
Plenty of good reasons to come to SIGCOMM
Mid-september is the perfect time to be in the south of France.
Real food, mediterranean cuisine.
Visit the Picasso, Matisse, Chagall, Huitema (under construction) museums
Attend SOPS in Saint-Malo two weeks after SIGCOMM.
Visit Monaco before it becomes a Chinese property.
Attend the first "pool session" in the history of SIGCOMM.
Have you ever been to the French Riviera ?
Better wine than at SIGCOMM '96.
... and, of course, an outstanding technical program !
Here are other links that may help convince you ...
The Weather in Nice
Travel information on France
Travel information on Cannes