Tickets for the International 5 will go on sale next Friday, March 27.
The International 5 takes place at the Key Arena in Seattle, from August 3 through to August 8.
Tickets for the event will go on sale at two different points, one batch going on sale at 5pm on March 27 and another going on sale at 5am on March 28 (UK time). Tickets will set you back $99 and give access to all six days of the event. The tickets will be available through Ticketmaster.
VIP tickets will not directly be sold this year, although Valve has promised more info on the VIP experience will be announced soon.
You can see a breakdown of what time tickets will go on sale in your county in the Dota 2 blog post.