Question

some cells have several nuclei with in their cytoplasm considering the events in typical cell cycle which phase of the cell cycle is not operating when such cells form

Answer 1

Cytokinesis - the separation of cytoplasm and organelles into distinct daughter cells. Clearly mitosis is happening, since there are multiple nuclei, each containing a complete set of genetic information.

Answer 2

Unless you are talking about fungi or certain times during plant life cycles.