A short-stay visa exemption and permission to work are different matters. First confirm the current exemption conditions for your exact passport category through Romania’s Ministry of Foreign Affairs. Where an exemption applies, passport validity, entry conditions and the 90/180-day limit still matter. Attending a meeting or trade fair is not necessarily equivalent to carrying out work in Romania. Employment, longer study and stays beyond the short-stay framework can require separate visas or permits. Describe the actual activity rather than relying only on the wording of an invitation, and verify the appropriate category with the responsible authority.