 
 <prompt> Wetin be di purpose wey Kingdom Hall dey serve? Based on di question wey dey above, write one context wey go contain di answer. E fit be 1 - 20 sentences. Context: <response>: Meetings for worship and study dey happun for Kingdom Halls, wey dey usually simple, and no get any religious symbols. Witnesses dey assigned to one congregation wey dey their area wey dem dey usually live and dem dey attend weekly services wey dem dey call "meetings" as congregation elders don schedule am. The meetings dey mainly focus on study of Watch Tower Society literature and the Bible. The format of the meetings dey set by the religion headquarters, and the subject matter for most meetings na the same worldwide. Congregations dey meet for two sessions every week wey dey consist of five different meetings wey total about three-and-a-half hours, dem dey usually gather mid-week (three meetings) and for weekend (two meetings). Before 2009, congregations dey meet three times every week; dem come reduce the meetings, with the aim make members dedicate one evening for "family worship". Gatherings dey start and end with kingdom songs (hymns) and brief prayers. Twice every year, Witnesses from different congregations wey form one "circuit" dey gather for one-day assembly. Larger groups of congregations dey meet once every year for one three-day "regional convention", usually for rented stadiums or auditoriums. Their most important and solemn event na the commemoration of the "Lord's Evening Meal", or "Memorial of Christ's Death" on the date of the Jewish Passover. 