Report on the 12th conference and labs of the evaluation forum (CLEF 2021): experimental IR meets multilinguality, multimodality, and interaction. - Candan, K. Selçuk; Faggioli, Guglielmo; Ferro, Nicola; Goeuriot, Lorraine; Ionescu, Bogdan; Joly, Alexis; Larsen, Birger; Maistro, Maria; Müller, Henning; Piroi, Florina (SIGIR Forum, 2021)