Requirements:

• File must be in Excel format (.xlsx)
• Only sheets with names ending in "_1" will be processed
• Headers must be in row 2 (Excel row 2)
• All 23 required columns must be present in exact order
• Required columns: REC, DATE, DAY_OF_WEEK, START_TIME, EVENT_NO., EVENT_NAME_C, EVENT_NAME_E, GTD, BUY_IN_TWD, BUY_IN_PRIZE_POOL, BUY_IN_FEE, STACK, BLIND_LEVEL_TIME, BLIND_LEVEL_TIME_BEFORE_LATE_REG, BLIND_LEVEL_TIME_AFTER_LATE_REG, LATE_REG, LATE_REG_LV, LATE_REG_TIME, DAY_OF_LATE_REG, BUY_IN_TIMES, SPECIAL_CASE, HASHTAG_GAME, HASHTAG_EVENT