Those who wish to securely dispose of sensitive papers have an opportunity to have them safely shred Saturday during “Shred Day” by BrightBridge Credit Union, formerly Merrimack Valley Credit Union. Members of the credit union and the community at large are invited to bring outdated or unwanted documents with sensitive information. This includes documents containing a signature, account number, social security number or medical or legal information that is no longer necessary to keep. Shred Day takes place Saturday, Sept. 20, from 9 a.m. to noon, at BrightBridge Credit Union, 500 Merrimack St., Lawrence. Shredding will also take place at the credit union’s Waltham and Bridgewater branches.