It is currently Dementia Awareness Week, running between 19 and 25 May this year.
Alzheimer's Society says it simply wants to get people talking about dementia.
It is using the hashtag #TalkDementia on Twitter, as part of the campaign.
The charity has an online forum for people to talk to others about dementia and tips about how to raise awareness.
It has also launched 'Five things you should know about dementia': it is not a natural part of ageing; it's caused by diseases of the brain; it's not just about losing your memory; it's possible to live well with dementia; and there's more to a person than dementia.
More top news
A few showers will affect coastal areas overnight, but elsewhere it will become largely dry.
South Wales police have tweeted images from the scene, which show a car on its roof.
Betty Campbell will be remembered with a statue in her hometown of Cardiff.