Familiarisation is a Distraction and Diversion. It is based on Summoning and was released on 16 February 2010. To start this Distraction and Diversion the player has to talk to Pikkupstix in Taverley, who can teach players the art of Summoning. Pikkupstix needs players to go to the spirit plane, the home of all Summoning creatures, and gather resources from it, from which the druids create spirit shards. The player has to find the one currently active small Summoning obelisk and mentally project themselves into the spirit plane. Pikkupstix will tell the player he has an apprentice, Pikkenmix, who knows which small Summoning obelisk is currently active. The player has to find the small obelisk and enter the spirit plane with the help of Pikkenmix. There, assuming the shape of a Summoning familiar, they need to gather as many piles of raw shards as possible while avoiding certain other familiars. An obelisk will only remain active for 20 minutes after which it will become inactive. The active obelisk changes every two hours. Participation in this Distraction and Diversion is limited to once per week.
(Note: if you happen to see an active obelisk before you've spoken to Pikkupstix about it, you can go ahead and talk to Pikkenmix and enter the spirit plane.)
Familiarisation has no requirements, not even the Wolf Whistle quest which is an introduction to Summoning. However it would be of benefit to complete the quests Fishing Contest, Underground Pass, Heroes' Quest, Lost City, and partial completion of Lunar Diplomacy and Eadgar's Ruse. These quests grant access to a greater number of Summoning obelisks, any of which could become the next active obelisk.
Since the obelisk changes every 2 hours, and only stays active for 20 minutes, it is most likely that there is no obelisk active at the time. The best way to find out when an obelisk is active is to open the Adventures interface and select the Minigames tab, from here you can select D&Ds from the drop down menu and see in real time when the next obelisk event will be active.