In a manner relating to formal rituals or ceremonies.

औपचारिकतापूर्वक

English Usage: The event was conducted ceremonially, with all the traditional rituals.

Hindi Usage: यह कार्यक्रम औपचारिकतापूर्वक आयोजित किया गया, सभी पारंपरिक रस्मों के साथ।