The Day of Archaeology is, yes, just one day long, but, as part of the celebration, Taylor and Francis is making 100 archaeology articles free to download for the next month and a half.
The free haul includes a wide assortment of papers from the Norwegian Archaeological Review (Theory! And Vikings!), World Archaeology (Is there a happier way to start your abstract than “Unusual funerary behavior is now an exciting area of research”?), Azania (the bananas in Africa debate, and more), Danish Journal of Archaeology (Including Mesolithic, Bronze Age, and Iron Age research. And more Vikings), and Time & Mind (Rock art, archaeoacoustics, and a little more unusual funerary behavior).
Check out the actual titles at Taylor & Francis’s 100 free archaeology articles.