Looks like Twitter has rescheduled their Open House to a later point of the month, and the event is now not happening at WWDC. May be Apple did not allow them to do so?
Just hours after Twitter opened the tickets for their Open House at WWDC, the company has rescheduled the event to a later point this month. The reason for this change is still unknown, but the event website now reads:
**Important Update: We’re going to reschedule our @TwitterMobile open house for later in the month. Stay tuned for an update. Apologies for the inconvenience!**
Thanks,
Twitter Mobile Team
Well, may be Apple did not want them to host such events at their own conference? Or the TOS of WWDC already has this? We have got in touch with Twitter to get some more details about this.