Question for fans in Seattle

So, I'll be visiting Portland late September for a business trip and I have a unique chance to catch the Seahawks game in Seattle. I don't think that I will get another opportunity this close for the next foreseeable future as I live in Turkey.

This will be my first NFL game ever.

Are there any fans that would tailgate there? If so, would you guys take me in as well? I just turned 40 and I like to think that I'm a nice guy and easy going. I won't be getting drunk but won't refuse a couple of beers before the game, heck, I can offer to bring them in, if you accept.

Also, do you know how are the Seahawks fans? As long I'm not a jerk or something, it should be okay to wear my jersey and my cap right?

I need to be at the King Station at 5:40 PM to catch my train, that's pretty safe right? Considering 15 min walk that Google Maps is showing.

So, as you can see, I'm a total noob, help me out : /