From the Federation of Astronomical Societies:
The annual CPRE star count begins on Friday 17th February. The more locations that report, the more useful the collected data will be, so no need to go anywhere particularly dark, unless you do so in addition to your back garden or urban balcony. Full instructions on their website:
https://www.cpre.org.uk/what-we-care-about/nature-and-landscapes/dark-skies/star-count-2023/