This text explores the ontological and phenomenological definition of presence, interpreted by the author as "being-present-at" (při-tom-nost). The central thesis posits that presence is not merely an isolated point in time but a complex structure where every actual phase of an event incorporates its own relative non-presence, namely its specific past and future. The author argues that the internal temporality of a "true" being, defined as an event with a distinct beginning and end, is indeed limited to the present, but in a profound sense: the entire event is essentially "present at" each of its individual phases. This perspective moves beyond traditional linear conceptions of time, emphasizing the dynamic wholeness of existence as an event. By integrating the past and future into every current moment, the entity maintains its integrity throughout its duration. The text thus provides an original insight into the relationship between temporality, existence, and the structural unity of an event, where every phase carries the weight of the whole occurrence.