ACON S2 Acquisition Corp. filed SEC Form 8-K: Entry into a Material Definitive Agreement, Completion of Acquisition or Disposition of Assets, Leadership Update, Unregistered Sales of Equity Securities, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, Material Modification to Rights of Security Holders, Changes in Control of Registrant, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Amendments to the Registrant’s Code of Ethics, or Waiver of a Provision of the Code of Ethics, Change in Shell Company Status, Regulatio