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Exhibition centre and convention centre are undoubtedly the same, not sure about conference centre though. Marcocapelle (talk) 08:39, 3 December 2021 (UTC)[reply]
Per Convention center, “A convention center (American English; or conference centre in Commonwealth English) is a large building that is designed to hold a convention”. –Aidan721 (talk) 14:20, 3 December 2021 (UTC)[reply]
I do oppose the British Isles categories (also after having checked a number of articles in the English category), i.e. renaming these will imply that exhibition centres no longer belong in the category, so that needs full discussion. (Note that a conference is not a unique British English word, it is also used in American English. But a convention in American English can be much broader.) Marcocapelle (talk) 20:46, 3 December 2021 (UTC)[reply]
I have processed the non-UK categories and trimmed the discussion here. – FayenaticLondon 11:15, 9 December 2021 (UTC)[reply]