same here . on our country , i didnt heard that charities are accepting bitcoins and as what i know , charities are usually clasic which means they are not into high tech stuffs. they only wanted to be simple , thats why they only prefer the old way of recieving donations usually in the form of envelope and some are in can coin bank/piggy bank.
in some countries there maybe charities that accepts bitcoin and other cryptocurrencies , which is also cool because we can see that crypto is now widely being adopted by the people and any other services not just online but also offline.