Some of the men in the chapter spend a half-hour on the risers; other members spent a half-hour in vowel matching.
In one situation, an editor should use a semicolon to join two word segments that are not independent clauses. If the sentence construction features a list requiring a number of commas that would be confusing to follow, it is permissible to use a semicolon as the main unit of separation. Here's an example:
Several Barbershoppers from our district attended Harmony College: Joe Williams, Lockport Chapter; Eddie Haskell, Delavor Chapter; Mickey Mounce, Dixon Chapter; and William Scoth, Tiskawa Chapter.
Using semicolons to separate the four individuals' names and chapters is a clearer way to present the information. An even simpler method is construct a table:
Several Barbershoppers from our district attended Harmony College:
Eddie Haskell, Delavor Chapter
Mickey Mounce, Dixon Chapter
William Scoth, Tiskawa Chapter