The number of bashows prior to announcing an engagement varies, as some have many bashows while others have as few as one, which is typical among the children of Hasidic Rebbes.
Bashert (or Beshert), (Yiddish: It is often used to refer to one's divinely foreordained spouse or soulmate, who is called "basherte" (female) or "basherter" (male).
It's expected that the couple keep the shadchan up-to-date on how the shidduch is going at regular intervals.
If the shidduch does not work out, then usually the shadchan is contacted and it is he/she that tells the other side that it will not be going ahead.
The prospective partners either date each other or in stricter communities they go to a "bashow" or sit in.