Every  event has a start and End  date/Time  and also every ticket sale has start and End date/time.  If the ticket sale start date is of future date than the current date/time  then the tickets will not show up.  In order to make your tickets visible, please set the Ticket sale start  date/Time to current date/Time.   

Also check the status of your ticket whether it is in Published state or in  Pause state.    If out of many tickets, you want to have one or  some of your ticket to be available for sale then just set   the ticket sale Start  date/Time to  future date/Time, don't change the status to Pause. If a ticket is  Paused, it will never be available for  buyers.  

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