There was Qt Day Italy in June. From what I hear, the event was a success. The talks were great and everything worked. This was the sixth Qt Day Italy, so there is tradition behind this event!
Even though it is not a Qt event, KDE Akademy is worth mentioning. Akademy is the annual world summit of KDE, one of the largest Free Software communities in the world. It is a free, non-commercial event organized by the KDE Community. This year Akademy was in Almeria Spain, in late July, 22nd to 27th. KDE has over the years brought many excellent developers to Qt, and they are definitely the biggest open source project using Qt.
Starting now is the QtCon Brasil event in São Paulo on August 18th to 20th. Taking inspiration from last years QtCon in Berlin, QtCon Brasil the first Qt community event in Brasil. The speaker list is impressive and there is an optional training day before the event. For South-American Qt developers right now is the time and place to be in São Paulo!
This year Qt Contributors' Summit is being organised as a pre-event to Qt World Summit, and we are calling it Qt Contributors' Days. As is tradition, the event will be run in the unconference style with the twist that topics can be suggested beforehand on the schedule wiki page. Qt Contributors' Days gathers Qt contributors to the same location to discuss where Qt is and what direction it is heading in. The discussions are technical with the people implementing the actual features going into details of their work.
You can register to Qt Contributors' Days at the Qt World Summit site, the nominal fee is to cover the registration expense, if it is an issue, please contact me.
The late summer and autumn are shaping up to be great times for Qt contributors!