听下面一段短文，根据所听内容完成下面的填空（每空填一词）。

    …often on the weekends．These parties may be held to certain time like birthdays，end of the school year，and the New Year…The person who invites guests usually servers simple and a small amount  of food．The children may spend the evening talking，listening to music and ．In the US …to have parties without their parents being ． Some parties …