The Mountain Campfire was a location that was hidden in The Mountains of the old map. You can go back to the old map by using D4C's F move and find the mountain in order to get to this location. The campfire includes models of admins, moderators, and developers of A Bizarre Day. However, during the oldest map, you could find this by going to the corner of the hidden barriers.
This special location can be found in ABD Beta.
The list and links of admins, moderators, and developers around the campfire can be seen in the infobox ontop.