Sky motion of two candidate events. Lens motion is marked in black (moving southwards and westwards in each case) and source motion from 2015.5 to 2035.5 in red (moving away from the red circle, showing the source position at 2015.5), for 100 draws from the Monte-Carlo samples. RA and Dec are given relative to the lens location at 2015.5. Left panel: DR2 5918299904067162240 (lens) and DR2 5918299908365843840 (source). Both source and lens motion are well-constrained, and there is a 46% probability of passing within 1R_E, around 2030 April 1. Right panel: DR2 4116504399886241792 (lens) and DR2 4116504399831319424 (source). The background source has only a two-parameter astrometric solution; by assigning it a proper motion drawn from stars in the same field of similar magnitude, we can predict a 20% probability of passing within 1R_E, around July 2020. In each panel, the Einstein radius is indicated by a blue circle.