Howdy!
First of all, welcome! It's great to see new people visiting our site looking for information.
So, to answer your questions, yes it's true, we run a weekend long game that doesn't stop. We generally play at Millersylvania State Park near Olympia (where we'll be this weekend!) or Camp Sheppard, near Enumclaw. Occasionally we have day games at Hamlin park, in Shoreline, but the really meat of the game is in the weekend long events.
I'm not sure what rule you're referring to that most larps don't have, but all of the established larps have safety rules. (Some groups of people who aren't really organized, like people who just meet up in parks or play in someone's back yard don't necessarily, but all of the larger, well-established games do.) If you are afraid that your weapons wouldn't be allowed, the problem is most likely to be that they don't conform to our group's safety rules.
Alliance is one of the largest LARPs in the US, and we have chapters in many states. Because we're a national organization, the safety rules are dictated by a national committee made up of people from all over the united states, and we have to follow them. For most people, this means that they'll have to get rulebook and make weapons that fit to the safety regulations laid out there, since their 'home made' weapons weren't made with those regulations in mind. Now, that's not to say that your weapons are unsafe, just that if they don't meet specific requirements (which you had no way of knowing when you made your personal weapons) or they won't pass the safety inspection required of all weapons at one of our games. It sounds picky, but it's a trade-off we make for being a part of such a large organization that grants so many other benefits.
You should check out the Alliance National site
here and the
FAQ here, then, when you've got more questions, we'll have a lot more answers.