1000 Shades of Verse pays homage to Mad Poets dead and living, past and present, including poems from the society's youngest members, Alice Charity and Jayden Bradley-Waaka (both 9) and the late Roy Tucker, the eldest at 98.
The Mad Poets were founded by Mr May in 1994 and, apart from Christmas and New Year breaks, has not missed a single week in 21 years.
"The Mad Poets have been a rich thread in Rotorua's art fabric," said long-standing member Nan Millar.
"We've always had members writing with mystical Maori magic. The group are as warm, witty and vital as when they welcomed me over 15 years ago."
Membership is around 30 and meetings are held every Wednesday, from 4pm at Atlantis Bookshop, Eurera St. Members are involved in readings at rest homes, schools and local radio.
Copies of 1000 Shades of Verse are available at Atlantis Bookshop.