**Our apologies if you receive multiple copies of this call** The ECML PKDD 2021 (Virtual) hosts a few DISCOVERY CHALLENGES: ÑFarfech Fashion Recommendations Challenge; ÑFinding the planet in the noise: De-trending exoplanet lightcurves from non-linear noise; ÑDiscover the mysteries of the Maya. For more information please visit https://2021.ecmlpkdd.org/?page_id=1610 *IMPORTANT DATES* Challenge Start: April 01, 2021; Challenge End: July 01, 2021; Challenge Results Notification: July 05, 2021; Paper Submission for Runner-upÕs: July 22, 2021. Conference: September, 13-17, 2021 (Virtual). Other events at ECML PKDD (Virtual): -regular papers (Research and Applied Data Science Tracks) https://2021.ecmlpkdd.org/?page_id=1599 -journal track https://2021.ecmlpkdd.org/?page_id=1341 -PhD forum https://2021.ecmlpkdd.org/?page_id=1591 -workshops and tutorials: https://2021.ecmlpkdd.org/?page_id=1603 Ñindustry track https://2021.ecmlpkdd.org/?page_id=1637