Save the Date Cards for Surprise Birthday Party Postcard

Postcard design celebrating / promoting: save the date cards for surprise birthday party. Postcard kind: inspirational / motivational. Visual style: mid-century modern, warm welcoming mood, pastel romantic palette. Hero illustration / photograph with the message / location name / company name rendered as clean placeholder typography in matching style. Print-ready 6×4 inch postcard composition, strong visual hierarchy, no watermarks. No real-celebrity faces. Where the postcard references a real location, render it tastefully and recognisably without infringing copyrighted attractions. Placeholder text rendered sharp and readable. Target search intent (rendered visually, no on-image text): "save the date cards for surprise birthday party" (en).