Hate-filled messages in secretive online chatrooms created using the Matrix.org system show supporters urging others to "prepare your weapon, devise your plan and then lure them in".
Potential targets include the Champions League final between Real Madrid and Borussia Dortmund at Wembley on June 1, the Olympics in Paris and the Euros in Germany this summer.
Followers are also directed to next month's T20 World Cup cricket tournament in the West Indies and US. Other sickening messages advise lone-wolf attackers to target Jews with "knives, guns and vehicles".
The vile exchanges took place on a network run by West London based Matrix.org.
Pro-Isis groups took advantage of its decentralised system to share tactics for terrorist outrages.
They shared blood-thirsty videos of their fighters executing civilians and burning churches in Africa as well as children with guns and scoreboards counting the deaths of "infidels".
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