This week only, assuage your guilt about shopping during economic hard times by spending your money at one of the dozens of retailers participating in Shop For Public Schools week. From today until Oct. 8, a portion of these retailers’ earnings will be donated to the Fund for Public Schools, to be used to provide library improvement grants to schools. Some retailers will also host special events, like a wellness event at a spa on Friday, a children’s book signing on Sunday, and a cupcake-decorating party on Monday.