I have made four event summons for knights of avalon and event counter still says zero.
Event summon counter not counting [SOLVED: It's not a counter, it shows how many Challenge Coins you have]
That is not the counter. You have currently 0 event coins. You need 10 for one free summon.
You can find out everything about these new coins, reading one of the threads open for this event, Knights of Avalon.
Omg. Duh! Thank you!