 Register now at WDEL.com to be a part of this community-wide educational fun program where kids get the opportunity to learn valuable life skills through real-life experience. Lemonade Day Wilmington is sponsored in part by Allura Bath & Kitchen and Urban Air Christiana. Who's ready for some lemonade? WDEL, Delaware's news radio. From the Highmark Blue Cross Blue Shield Sponsored Studio. Highmark, choose the plan Delawareans have counted on for more than 80 years.