If you missed the Halloween Easter Egg medals last year, today is your chance to get them. It's simple really. Visit every one of the current newground's staff's userpages and the medal will be rewarded. Props to Zxrus for pointing this out last year.
You can find the official list of the rad crew that manages this site here
Also, highly recommend checking out this forum topic & Extragrounds for more NG easter eggs (no medal treats here, just good old tricks).
Happy Halloween Everyone!