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Pattern matching against event streams is a new paradigm of processing continuously arriving events with the goal of identifying meaningful patterns (complex events). An issue arises when some events get delayed due to, e.g., network latencies or sensor and machine failures. In this work we propose a novel technique for processing out-of-order events without artificial delays. We present the design of an out-of-order event processor, and a general low-level garbage collector; both implemented in ETALIS system.