Distinguishing 'accompanied by' from 'in conjunction with'

I'm curious about the choice between 'accompanied by' and 'in conjunction with' when linking events. While both connect two occurrences, the former often implies a secondary status, whereas the latter suggests a partnership. In a sentence like 'The gala was held in conjunction with the exhibit,' does the grammar imply more equality? I’m trying to grasp how these connectors subtly change the perceived hierarchy.