I think they would need to prove they were the first to ever make a pale ale. According to their website they didn't start making the pale ale until the late 80's but pale ale was invented in 1980 according to Wikapedia.
The colors may be...similar...but in no way could a reasonable human be confused. That is like claiming your round peg looks amazingly like that square peg so it must reall be a square peg even though its round.
Having gone to Pax East every year since it started, I must say there are tons of these parties for every type of fandom. World Of Warcraft, League of Legends, Magic the Gathering, etc. Most of them are pub crawls and are put on by non-official companies. Several have become so popular that the actual owners of the content (Like Blizzard and Riot) have promoted them on their sites as well and embrace it. When you have tens of thousands of people spending 3 days buying, trading, playing, and talking about your games and content, you have advertisements that you can't buy. And this is a promotion of your product that can not be duplicated with any real success. Word of mouth is still the best advertising money can't buy.
It amazes me how companies don't look at the Startrek and Starwars Franchise more on how a strong fanbase with the ability to propagate the franchise with their own imaginations, can make the franchise last for a very long period of time. Where would either be now without the fan movement to keep it going?