Enter & build your own cardboard boat or just come to cheer on the courageous crews as they battle the waves in their cardboard vessels & to soak up the fun and event day activities, which include fun in Splashwater Beach and live music featuring Arlington’s own Luke Chacko and acoustic duo Almost Jaded from Young Stars & Guitars. Boat registration begins in February. Event-day admission is $8. Pre-purchase tickets at River Legacy Living Science Center for $6 by April 12. All proceeds benefit River Legacy Foundation and the educational programs of River Legacy Living Science Center.