散会 is a separable verb (离合词) meaning 'to adjourn a meeting' or 'to dismiss a gathering'. The verb 散 (to disperse) and object 会 (meeting) can be separated — you can insert aspect markers like 了 or 过, or complements like 完, between the two syllables, as in 散了会 ('the meeting ended') or 散完会 ('after the meeting ended'). The subject of the sentence is typically the meeting itself (as in 会议散会) or a group of people. It is an intransitive structure; you don't take a direct object.