Create a watercolor-style illustration for a urology event that does not include people. The image should focus on scientific elements related to urology. Incorporate abstract representations of molecules, medical instruments like a cystoscope or ultrasound machine, and fluid-like designs to evoke the flow of the urinary system. Use a professional and clean color scheme with shades of blue, white, and grey to evoke a clinical and scientific atmosphere. The style should be modern and detailed, with soft, flowing lines suitable as a background for a "Save the Date" announcement for a medical conference or seminar.