PREPARED BUTTON on preparation day if both clans are ready to battle.
When the matches are found for clan battles there is a preparation day. Sometimes both clans may have their bases and donations ready for battle well before the 24 hour preparation is finished. If you create a PREPARED BUTTON that only the leader can press when all clan members are ready, if both clans press this button the clan war could get started so both clans dont have to wait for the remaining time if they are both prepared.