According to Mojang.com, the Minecon 2016 tickets are going on sale on May 6 and May 7. If you are interested in going to Minecon, put down that date and get ready. Remember, in 2015, the first batch of tickets were sold out in three minutes, so you better move fast!
The tickets will be priced at $160 each, with 3 year olds and under getting to go free. The first batch of 6,000 tickets will be sold on 6pm PDT on Friday, May 6, and another batch of 6,000 tickets will be sold on 12pm PDT on Saturday, May 7. Remember, you CANNOT resell tickets, but you can refund them if you are unable to go, at least 15 days before the event.
More Information: http://www.mojang.com/2016/04/minecon-2016-tickets/