MARK. YOUR. CALENDAR. @ Singapore https://t.co/q7i29dsJBx
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Central Region
[{'url': 'https://t.co/q7i29dsJBx', 'expanded_url': 'https://www.instagram.com/p/CBZ_aFQBz0c/?igshid=1w6g0ulfm3v4p', 'display_url': 'instagram.com/p/CBZ_aFQBz0c/…', 'indices': [34, 57]}]
MARINA CENTRE
['mark', 'calendar', 'singapore', 'https://t.co/q7i29dsjbx']
[]
mark your calendar
mark calendar singapore
  [
    {"relatedness": False, "type": "none", "explanation": "This is not related to maintenance report feedback for public flat houses."},
    ]

It seems that the tweet "mark calendar singapore" does not relate to a maintenance report feedback for public flat houses in Singapore. Therefore, the answer is { "relatedness": False, "type": "none", "explanation": "This is not related to maintenance report feedback for public flat houses." }.