How to check wether external contest will effect rating

I wanna know how to find wether participating in the external contest (contest apart from monthly long challenge,cook off and lunch time)will effect rating. there is no hint or tag on contest . For eg last night i gave aarambh contest for which i am not rated yet though for moscow workshop contest i was rated.Thanks in advance for your response.

To answer your question, we will specify in brackets whether it will be rated or not. Eg- Moscow workshops had (Rated for all) in its heading/name on future contests. By default, assume external contests to be unrated unless specified otherwise. Hope that helps.