What are the roles of the minor characters Mr. fezziwig, fred and bob.c in a christmas carol?

Bob Cratchit - Scrooge's clerk, a kind, mild, and very poor man with a large family. Though treated harshly by his boss, Cratchit remains a humble and dedicated employee.

Fezziwig - The jovial merchant with whom the young Scrooge apprenticed. Fezziwig was renowned for his wonderful Christmas parties.

Fred - Scrooge's nephew, a genial man who loves Christmas. He invites Scrooge to his Christmas party each and every year, only to be refused by his grumpy uncle.