Use 'assemblage' to describe collections of non-living things, not to describe a mechanical process. The museum showcased an assemblage of rare coins.
Pro Tip 2/3
Formal Gatherings
'Assemblage' can imply a formal or organized gathering of people, not just a casual meeting. The conference began with an assemblage of eminent scientists.
Pro Tip 3/3
Impersonal Tone
Using 'assemblage' in social contexts can sound impersonal, implying a focus on the group rather than individuals. An assemblage of volunteers gathered to help.