LA2DAY’S Art & Design writers put on some impossibly skinny high heels and spun on down to ArtSeen3’s opening shindig, last Monday night, and afterparty at the Standard. Yearly, ArtSeen3 features scads of emerging artists, fabulous food by way of A Taste of Los Angeles and an auction of celebrity-donated work (goes on this Saturday night May 17) -- all to benefit the AIDS Research Alliance. Missed it? Dang! That’s why we’re here – to show you what kind of fun can be had with or without you! Here, a geriatric tease before the full article that both scares and tickles us: someone’s gramma packing some semi-serious heat…