rain or shine

Question

How do I tell people an outdoor event will be held regardless of the weather, or "rain or shine"'

Answer 1

Here are several from different countries.

pase lo que pase (Mexico)

llueva o nieve (Spain)

Llueva, truene o relampaguee (Mexico)

venga lo que venga(Mexico)

llueva o truene (Argentina)

Answer 2

el acontecimiento occurirá llueva o haga sol