While The Offspring concert isn't until August, OKC's Zoo Amphitheater is doubling down their ticket four-packs throughout the 4/20 weekend. Offering four packs of $20 tickets + their fees. Which is a bummer, because the ticket fee is $12.60 per ticket... That means your $80 four pack shoots up to $135-ish. Still, $32 tickets aren't bad, and the Zoo Amp is probably the best concert venue in Oklahoma. The 4/20 pack is good through 4/22.