ACM/IFIP/USENIX Middleware conference will be in Montreal.

"The ACM/IFIP/USENIX Middleware conference is a premier forum for the discussion of innovations and recent advances in the design, implementation, experimentation, deployment, and usage of middleware systems. Middleware is the software that resides between applications and the underlying architecture. The goal of middleware is to facilitate the development of applications by providing higher-level abstractions for better programmability, performance, scalability, security, and a variety of essential features. It is a rapidly evolving and growing field.   The 13th International Middleware Conference will be the premier event for middleware research, technology and experimentation in 2012."