They all exist already. Just because you don't know about them doesn't mean they don't exist.
South Asia month:
https://www.london.gov.uk/city-hall-blog/south-asian-heritage-month
Jewish Heritage Month is the month of May
Many people celebrate Chinese New year here in the uk.
Tell your friends to get involved.
White history month runs every one from January to December, just pop into any museum, watch any history program, grab a random history book from a library, buy a GCSE history book, or any A level one .... Pretty hard to miss really! Impressive really, considering whites are the minority race on the planet, and so late to develop.
Chinese, Indian and African cultures developed milllenia before white Europeans built war ships and cannons. We were just barbarians when they were creating civilisation, maths science, philosophy, and religion.. when the Romans first came to the British isles in 50BC there wasn't anything at all worth conquering, so they went home and left us to our mud huts and boiled rabbit.