The following is a message from Supercell.
Writing a quick post to let you know about something we are working on: the Clan Challenge.
With Clan Challenges, Clans will be able issue a friendly War request to any other Clan daring to accept the challenge!
Choose war participants, set the duration of preparation/battle days and send your Clan Challenge request! As soon as the opposing Clan accepts the request, preparation day will begin.
This feature is not meant to replace Clan Wars (you can’t issue a Clan Challenge while there’s an ongoing Clan War), but it will offer better support for events and meet-ups organized by players, as well as other online/offline Community initiatives.
Keep in mind this is just a rough preview of things to come and we will provide more details at a later point.