duffers’ fortnight
n.— «In May many anglers from South Wales went over to Lough Mask and had a great time in the mayfly season. Mayfly time is often termed as the Duffers’ Fortnight because the catches are always so good.» —“Our prayers are answered as downpour fills the rivers” by Moc Morgan icWales (United Kingdom) May 29, 2007. (source: Double-Tongued Dictionary)