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To "summon" or "summon up" usually does not mean to call someone, in the sense of calling on the phone or shouting. In a legal setting, it can mean to insist that someone appear for court or a trial, which is usually done by letter. But most often, "summon" or "summon up" are used as idioms to mean that someone forced or persuaded himself to do something difficult or unpleasant: "After an hour of thinking about it, I summoned the courage to tell my boss I was quitting." "Somehow, despite my own grief, I managed to summon a smile for the little girl who held my hand amid the rubble." "Summon" here comes from the meaning of using magic or sorcery to conjure a demon (i.e., to force it to appear).

Yes, you're right, but when you use yet to be instead of will be, it means something is about to happen or will take place in the near future,

"Unravel" can mean "reveal" like you suggested, but it specifically is making you think about a tangled-up mess, like tangled ball of string. You have to "unravel" the complicated mess to understand what's going on. So it's specifically means to figure out something complicated. (It also can be used non-figuratively when you are truly unravelling a ball of string ;) ) "Yet to happen" means it hasn't happened yet.... but not necessary that it is going to happen very soon.