Page 27 - CEFR Infographics by RTNLC Miscellaneous

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More broadly, the holiday is a celebration of beginnings,
commemorating not just the Buddha’s first sermon

(ธรรมปฐมเทศนา) but also his conception and the day he
renounced his royal life to become an ascetic.This day is an

auspicious one to begin a new venture or renew lapsed
resolutions.

Asalha Bucha is followed by Vassa (Phansa-Bhuddhist Lent),
it is known in Thai as khao phansa, which marks the beginning

of the annual three-month Buddhist Lent, or Buddhist Rains
Retreat. It falls on the first day of the waning moon (ข้างแรม) of
the eighth lunar month.

References:
https://www.unhcr.org/50be10cb9.pdf
https://www.m-culture.go.th/en/article_view.php?nid=40
https://exploringyourmind.com/9-buddhist-teachings-better-life/
https://hilight.kapook.com/view/26024
https://tricycle.org/magazine/what-is-dharma-day/