This is probably definitely too late. But...
if you arrive earlier than most people who put their names in, you can ask them if they are planning to put their name down for one ticket. If so, ask them politely if they can sign up for two so your third friend can get that extra ticket in that time.
The only downside to that is if you don't get called and that person does, you'll probably have to pay for the extra ticket. Hey, lottery's a game of chance, no?
Call me Travis. :)