I recommend you to look up your dictionary once. Because of there are a lot of words and some are not much related each other, I can only give definition like dictionary.
列席、参列、参会 are formal words and not used in usual conversation. 参与 is most likely appeared in someone's resume or profile. 相伴 is rarely used in modern Japanese, maybe only appear in novels. 出席、参加、関与、加盟 are everyday words
列席 is a formal word only used for some ceremony like wedding or funeral. 参列 is almost same word. ・葬儀に列席する
出席 is used for classroom or meetings, which you are expected to have your seat. ・授業に出席する
参与 means working in a project, formal word. ・食糧問題を解決するためのNPOに参与した経歴がある
参加 is most neutral and general word for joining to a group, a party, etc. ・展示会に参加した。
参入 is used when a company is entering into a new industry. ・Googleが携帯電話業界に参入した。
参会 means attending a formal party or similar event. Similar to 列席 or 参列 but used for more usual gathering. ・学会の60年記念パーティに参会する。
相伴 means do something together, especially having a dinner. I feel this is old word and not used much. ・ご相伴にあづかる。
関与 is a general word for having relation to a project or an incident. ・殺人事件に関与する。
加盟 is used when a company or a country joins into some bigger organization and starts to follow its rule. ・国連に加盟する。
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