Several of anne's closest friends celebrated their twenty-year friendship with her by delivering a series of short comical accounts of their relationship with anne. which type of special occasion speech did anne's friends use

The fact that  Anne's closest friends celebrated their twenty-year friendship with her by delivering a series of short comical accounts of their relationship with Anne means that they used the roast type of special occasion speech .
The roast type of speech is humorous and pokes fun at the honored person in a friendly way.