The PyCon PL 2015 will be held in Hotel Ossa Congress & Spa located in Ossa on October 15th through October 18th. The conference is held in Poland but consists of two blocks of talks - English and Polish, so non-Polish speaking attendees can benefit from it too.
The agenda and other details can be found on the conference website.
If you are interested in participating be sure to check out the sign-up and prices pages. The sooner you register the cheaper if will. I'll have a Polish talk about PyQt and using it as an aid in Python developers work/life.