(READING & PARTY) Arcade is a northwest quarterly that focuses on architecture and design. The journal is vital, as serious architecture is not covered by any other publication in our city. This is a party for the summer issue, which features a piece by Rebecca Brown-who is giving a special reading tonight-and a variety of essays on the subject of industrial design. And it's happening at the very posh W Hotel. (W Hotel, in the lobby, 1112 Fourth Ave, 971-5596 for info. 5:30-7:30 pm, free.)