Does anything happen randomly?
Yes.
9:11 I returned, and saw under the sun, that the race is not to the swift, nor the battle to the strong, neither yet bread to the wise, nor yet riches to men of understanding, nor yet favour to men of skill; but time and chance happeneth to them all. Ecclesiastes
Let me explain this briefly; God being sovereign doesn't mean that He must 'micromanage' the universe. (Makining certain that every leaf that falls from every tree, falls at the exact place God decreed it to land.)
9:12 For man also knoweth not his time: as the fishes that are taken in an evil net, and as the birds that are caught in the snare; so are the sons of men snared in an evil time, when it falleth suddenly upon them. Ecclesiastes
God can be in control, without micromanaging anything. Because God is omniscient, He is NEVER taken by surprise; rather, He is already prepared for what happens.
Allow me to give you an example from Scripture:
1:1 Now the word of the LORD came unto Jonah the son of Amittai, saying,1:2 Arise, go to Nineveh, that great city, and cry against it; for their wickedness is come up before me. Jonah
God told Jonah to go to Nineveh to preach against it, but Jonah decided by his own will to go in the opposite direction.
1:3 But Jonah rose up to flee unto Tarshish from the presence of the LORD, and went down to Joppa; and he found a ship going to Tarshish: so he paid the fare thereof, and went down into it, to go with them unto Tarshish from the presence of the LORD. Jonah
God neither decreed Jonah to disobey, nor was God unprepared for Jonah's disobedience.
1) In Jonah's free will, Jonah chose to disobey God.
2) In God's foreknowledge, God knew the decision Jonah would make, as well as the decisions of those on the ship, including Jonah being cast overboard.
3) In God being sovereign, He also was prepared to deal with Jonah by preparing a fish to swallow Jonah.
1:17 Now the LORD had prepared a great fish to swallow up Jonah. And Jonah was in the belly of the fish three days and three nights. Jonah
Notice the words, "Now the LORD had prepared". The words "had prepared" showed that this was done by God because He had foreknowledge of the event (whatsoever comes to pass) but he did not decree the disobedience of Jonah.
4) In God's omniscience God knew exactly what was necessary to cause Jonah to repent, and willingly desire to obey God.
After spending three days and nights in the whale, Jonah prayed to God in repentance.
God never decrees sin, but He allows it. (Huge difference)
God was never out of control in the Book of Jonah. God allows "chance" to happen, and He allows man to exercise their will, without decreeing the end result of their decisions. He can do this because "foreknowledge" is part of omniscience.