Host yearly, or perhaps every 6-month, charity events where you bring the charity into your location and build awareness of their efforts and the cause.
When it is time to donate, host an in-store event and invite customers, the charity, the media, and city officials. Present the charity with an oversized check. Serve food and drink. Have a band. Make it a celebration. See our In-Store Events: Parties Activity for more details on planning your event.