Allowed with notice
For non-detained individual calendar hearings, advance filings are generally due at least 30 days before the hearing and responses are due within 10 days after the original filing; detained-case deadlines are set by the immigration judge.
Read supporting source excerpt
For individual calendar hearings involving represented, non-detained aliens, amendments to applications for relief, additional supporting documents, updates to witness lists, and other such documents must be submitted at least thirty (30) days in advance of the individual calendar hearing.
The requirement is stated in current official court rules and is attached at court scope, not as a personal preference.