Yes, I wonder how they fill all of those days. Perhaps there will be a few local bands filling in. It might be interesting to hear some new sounds.
Flower and Garden for MANY years had 7 days per week Concerts(Flower Power Concerts) and it was always "name" Bands.
Here was the lineup for 2008.
March 19-22 The Guess Who
March 23-24 Petula Clark
March 25-29 Paul Revere and the Raiders
March 30-31 The Fifth Dimension
April 1-3 The Nelsons
April 4-5 Jay Black
April 6-9 Herman's Hermits starring Peter Noone
April 10-12 The Grassroots starring Rob Grill
April 13-16 The Happenings
April 17-18 Peter and Gordon
April 19-23 Starship starring Mickey Thomas
April 24-26 The Ventures
April 27-30 B. J. Thomas
May 1-3 Arlo Guthrie
May 4-5 The Searchers
May 6-10 The Tokens
May 11-15 Davy Jones
May 16-17 Jose Feliciano
May 18-20 Felix Cavaliere's Rascals
May 21-24 Gary Puckett
May 25-27 The Cowsills
May 28-June 1 Tony Orlando
So there were 22 Acts for 2008 as opposed to 16 Acts for the 2017 Garden Rocks.