Just got a call from this number. I didn't answer, but they didn't leave a message. I saw a couple of comments here that say it was from the Red Cross, so I googled it. The number that came up was different - (517) 484-7461. I'm thinking that if it were really the Red Cross, they wouldn't be calling at almost 8:30pm.
It is american red cross, the number on the website is different than each area number, I get calls from this number all the time as I have a rare blood type, and I typically answer because I know who it is and what it is for