Interestingly such ritual is common in Hinduism. Vesak Day is also known as Buddha Purnima, a full moon day that marks birth, enlightenment and also death (Final Nirvana) of the Gautama Buddha. Also interesting to see a baby Buddha statue. Both Buddhists and non-Buddhists were performing this ritual.
A woman pouring warm fragrant water over a baby buddha statue as part of the “Bathing of the Buddha” ritual on the Vesak Day celebrations at Bugis, Singapore
Brahma is one of the trinity of Gods in Hinduism too even though not found in Indian temples. He is widely worshipped in Buddhism and in South East Asia.
People worshipping Phra Phrom, the four faced Brahma, in the roadside Thai Buddhist temple, Golden Mile Complex, Beach Road, Singapore