BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
SUMMARY:活动
DESCRIPTION:活动详情
LOCATION:https://yourwebsite.com
DTSTART:20260501T120000Z
DTEND:20260501T140000Z
BEGIN:VALARM
TRIGGER:-PT10M
ACTION:DISPLAY
DESCRIPTION:活动即将开始
END:VALARM
END:VEVENT
END:VCALENDAR