When we attend Geowoodstock, we always like to read the banners that tell about previous Geowoodstocks. If you know about past Geowoodstocks, you won't have any trouble with this puzzle.
Final coords are: N 39 0A.BCD W 084 X0.YZ0
A = First Geowoodstock with t-shirts and geocoins
B = One of the associated events during this Geowoodstock was a hike to the A.P.E. Cache
C= Attendees to this Geowoodstock were encouraged to bring "Happy Meals" so they would have a trinket to share
D = The site chosen was under a highway overpass in case of rain
X= At this Geowoodstock, attendees were treated to a free catfish dinner
Y= Onsite camping was offered at this Geowoodstock
Z = This was the first Geowoodstock to create a separate area for vendors
Congratulations to kim--possible for First To Find