I have tried every combination of actions, waiting certain times in between but with no luck, one time i waited 1 hr did missions using 3500 energy and rob/attack people about 26 times and I summoned one, come on gree this can't be your answer to new exciting special event! You guys should be catering to your customers not the other way around.
If someone can give me some tatics that worked for them that I might apply to my game play! Thanks!!!