The word that means "takes place" is "occurs."
The prefix that means "in advance" is "pre-." Adding this prefix to a word indicates that the action or condition occurs before something else.
The word infrequently means not very often or not frequently.
It means "before" as in to tell something before it happens: predict, foresee, or prognosticate.
A prefix occurs before the root word.
Imminent
Occur
One of the root words of edict is "dict", which means "to speak". Some other words with the same root word of "dict" are contradict, which means to speak against; dictation, which means to write down what someone says; predict, which means to say what will happen before it occurs; and dictionary, which means a reference book in which spoken or written words are defined.
A ten letter word for something that occurs could be an occurrence or happenings.
"Observe" means to watch something happen.
It means to expect, or predict what will happen next."You must anticipate the consequences of smoking pot before you do it."
pre-