General Admission tickets to The Great Googa Mooga music, food, and drink festival are free. They'll be given away online from noon on Thursday, March 15th, through midnight on Sunday, March 31st--or until the Early Registration tickets run out. You can register for either Saturday, May 19th, or Sunday, May 20th, but not for both days. One ticket admits you and three other people.
music: The not-yet-announced musical acts will include national and local artists performing in various genres. Ten acts per day will appear on each of the two stages in the Nethermead Meadow.
food: Browse the linked list of some of the 75 food vendors.
wine tasting and beer tasting: The Wine Tasting Pavilion will feature over 100 wines from around the world. The beer-tasting Pavilion will present over 30 different domestic and foreign craft beer makers.
Food and drink are on the pay-as-you-go system.
Or, for $249.50 per person per day, you can participate in Extra Mooga, "a festival-within-a-festival, an all-inclusive food-and-drink-lover’s experience set in a beautiful wooded area of Prospect Park."