Euro-Par is the prime European conference covering all aspects of parallel and distributed processing, ranging from theory to practice, from small to the largest parallel and distributed systems and infrastructures, from fundamental computational problems to applications, from architecture, compiler, language and interface design and implementation, to tools, support infrastructures, and application performance aspects. To provide a meeting point for researchers to discuss and exchange new ideas and hot topics related to parallel and distributed computing and their applications, Euro-Par 2023 will co-locate workshops and, for the first time, minisymposia with the main conference. This is an invitation to send proposals for the workshop and, for the first time, a minisymposium program. Both workshops and minisymposia will be held on August 28 - August 29, 2023, the first two days of the conference.