Do conferences get indexed? A funding organism is offering to pay for the travel and stay of young researchers to an international conference, when said conference is indexed (Scopus, WoS, ...). They insist on the fact that it’s the conference that should be indexed, not the proceeding or subsequent publications. 

I never heard of a conference being indexed, and would like to know if this even exists. 

I insist on the fact that the indexing in question concerns the conference, not the proceedings or abstracts.
I don't have a precise answer. However, the fact that some papers &amp; abstracts are indexed in Scopus or Web of Science implies that the conference is indexed there.

If the funding agency wants the conference to be indexed, it might mean that some of the papers/abstracts should be indexed, not necessarily yours. With that, they will be able to judge the quality of the conference (very subjective, but that not's the point), and your acceptance letter is enough for them.

One example is IEEE APS/URSI. There are different formats of submissions: 


full papers (that are indexed for sure)
two-page abstracts in IEEE 2-column template (which are indexed unless author opts out)
one-page abstracts in a 1-column template (which are not indexed)


Thus, some submitted papers will not be indexed; however, the presentations will be made during the conference for all submissions. So, the conference is indexed, but not all the proceedings.