Just make sure you arrange your host in advance if you'll be asking someone to guest you in. Over the last few months I've encountered more frequent "lounge lizards" (heck, if you're going to call the lounge agents "Dragons" then you should be ok with calling these folks "lizards") who hang out near the elevator or escalator to the Envoy lounge and try to get strangers to guest them in. I used to see a lot of this outside one of the DL SkyClubs in ATL and the biggest UA RCC at ORD but I suppose it happens everywhere. I've got nothing against asking for favors in advance, and have on occasion guested acquaintances into various clubs (even guested a co-worker into the CO PC in ATL then left) but I think it's kind of tacky to be hanging outside the club asking random strangers to let you in right then and there.