This is the 8th and 9th volumes of the Proceedings of the Conference of Celtic Students, held annually by the Association of Celtic Students. This combined volume is a section of 18 papers in four of the Celtic languages and English given at the 2020 and 2021 conferences which were hosted digitally and in-person at University College Dublin. The 2020 volume contains the following papers: Finn Longman - 'What manner of man is this Hound?': Gender, Humanity and the Transgressive Figure of Cú Chulainn; Anastasiia Bogdanova - Making Irish Stories Accessible: Alexander Smirnov and his Works in Irish Studies; Julieta Abella - 'True Irish prose has a steely latinistic line': Irish-Latin Connections in Myles na gCopaleen's Cruiskeen Lawn; Olivia Klee - "B'fhearr dhoibh a bhi 'n America": Beachdan air às-imrich às a' Ghàidhealtachd ann an irisean ag amas air Gàidheil, 1871-1883; Vojtěch Halama - Who Is 'Everyone'? Inclusivity in the 1966 and 2016 Official Commemoration of the Easter Rising; Deirdre Ní Mhathúna - Dùthchas, an 'àrainneachd' agus an dùbhlain: Na Gàidheil agus na h-eag-eòlaichean an aghaidh atharrachadh na gnàth-shìde; Jack Pulman-Slater - Sounding Welsh in Welsh: Prosodic transfer in adult learners; Jeff Justice - Make Live or Let Die: Applying Biopolitics to the State of Scottish Gaelic. The 2021 volume contains the following papers: Freya Smith - Crying over the body? Physicality and gender in three Medieval Irish laments; Severine Munro - 'Ny wnn i amgen no'm bot': a queer feminist reading of Math uab Mathonwy; Claudia Zimmermann - Twins or distant cousins? - A new approach to the relative distance between the Middle Welsh Ystoryaeu Seint Greal and their French sources; Nathanial Harrington - 'Mae llyfr yn ddelwedd o fywyd': Fìorachd is ficsean ann an An Dosan Norma NicLeòid is Melog Mihangel Morgan; Alexandra Philbin - An Ghaeilge san Ardchathair: Íomhá an chainteora Gaeilge i mBaile Átha Cliath in Ainmhí Eile Ar Fad le Ciara Ní É agus Siúcrale Roxanna Nic Liam; Susannah Paice - Positive Psychology in Welsh Second Language Acquisition: The Confidence-building Diary as a Reflective Tool; Kensa Broadhurst - Kernewek yn adhyskans formel; Clément Guillanton - Prederouriezh Fañch Kerrain e-sell an emsavioù lennegel ha prederourel brezhonek, Kudennoù kalvezel ar sevel gerioù brezhoneg en un aergelc'h a ziglosiezh; Máirín NicFhionghuin - Anailís Chomparáideach Foclóireachta ar Ghaeilge na hÉireann agus ar Ghàidhlig na hAlban.