Produced by Uma Pedra no Sapato and promoted international by Agência - Portuguese Short Film Agency, "Party Day" had is international premiere at Semaine de la Critique of the Cannes Film Festival and is national premiere at Curtas Vila do Conde. "Party Day" follows Mena on the birthday of her daughter Clara, and has the participation of actresses Rita Martins, Melissa Matos, Teresa Madruga, Sandra Celas, Mariana Silva, Sara Gonçalves and Fernanda Neves.

The programers of the Shorts section describe the film: "A cash-strapped single mother is pulled into an unresolved family conflict as she struggles to host her daughter’s seventh birthday party. Sofia Bost’s 16mm-shot drama, filled with illuminating performances, renders a complicated depiction of motherhood and the inconsolable grievances inherited by each generation."