According to this press release, some of the UNSCR 1540 committee’s activities concerning its ongoing Comprehensive Review will be delayed:

As noted on 29 April, this year is an important one: The Committee is conducting a Comprehensive Review, prior to renewal of its mandate on 25 April 2021. The plans included, amongst other events, open consultations with Member States and international, regional and subregional organizations, as well as civil society as appropriate. A report on the Review was scheduled to be submitted to the Security Council by 31 December 2020.

However, due to delays caused by the coronavirus pandemic and in order that States may plan accordingly, the Committee has decided that all activities related to the Comprehensive Review, including the open consultations, will be postponed until 2021 with the exception of the process currently under way of revising the Committee matrices, and any other activities that can be undertaken in a virtual format. The Committee will provide further details as soon as it has finalized its plans.

Here’s the 1540 committee April 29 briefing mentioned above. UNSCR 1977 extended the committee’s mandate until April 25, 2021.