ized proffer of evidence" the defense sought to admit under Rule 412 by December 6, 2019, in advance of a January 13, 2020 trial); United States v. Backman, 817 F.3d 662, 669-70 (9th Cir. 2016) (concluding that district court did not abuse its discretion when setting Rule 412 deadline more than 14 days