To book a date, you must go to the portal of public services in the RT section "Services Registry Office" and submit on-line statement: select the location, time and date of registration, pay a state fee and make an appointment. Apply in person to the registrar must be no later than one month and two days before the wedding, to submit a written statement, according to Office of Civil Registry Office of Kazan.
Note that in the next year will be as "happy choice" as 16/06/2016 and 20/06/2016.