There is one message that is important to put across to you... the event attendees:
TICKETS ARE CASH ONLY!!!
Anything else you can use interac or credit cards on. Take for example these recent arrivals:
Shearwater - Rook (Matador)
Spiritualized - Songs in A & E (Spaceman)
Accidental - There Were Wolves (Thrill Jockey)
Aethenor - Bedtimes Black Cloudmasses (Southern Lord)
Boris - Smile (Southern Lord)
Bowerbirds - Hymns to a Dark Horse (Dead Oceans)
Eric Chenaux - Sloppy Ground (Constellation)
Mount Eerie - Black Wooden Ceiling (k)
The National - A Skin, A Night DVD+EP (ADA)
Photon Band - Back Down to Earth (Emperyean)
Silver Jews - Lookout Mountain (Drag City)
Venetian Snares - Detrimentalist (Planet Mu)
Vetiver - Thing of the Past (Gnomonsong)
War on Drugs - Wagonwheel Blues (Secretly Canadian)
Wooden Shjips - Vol. 1 (Holy Mountain)