Congress Campaign Ticket can be obtained by completing special task in the estate from 10:00-10:15, 16:00-16:15 or 20:00-20:15. Each player can only complete special task once per day. OR other way is Congress Campaign Tickets are sendable , so you can also players in same Server if they get any free Tickets to send .
Click on cgs - bottom row of game , from there you can place bid in one of the open spot
You can see the time after which it open for bidding is shown in first picture's time(12:38,first row)
Bidding info is given in 1st post