As in previous years, VBS2021 will be part of the International Conference on MultiMedia Modeling 2021 (MMM2021) in Prague, Czech Republic, and organized as a special side event to the Welcome Reception on January 25, 2021. It will be a moderated session where participants solve Known-Item Search (KIS) and Ad-Hoc Video Search (AVS) tasks that are issued as live presentation of scenes of interest, either as a visual 20 seconds clip (randomly selected), or as a textual description. The goal is to find correct segments (for KIS exactly one segment, for AVS many segments) as fast as possible and submit the segment description (video id and frame number) to the VBS server, which evaluates if the found segment is correct.