Thatrhodylady, <a href="https://creativecommons.org/licenses/by/4.0/" rel="license">CC BY 4.0</a>, via <a href="https://rhododendra.com/">Rhododendra.com</a>
Tag on the tree says R. orbiculare ssp cardiobasis this must be a white flower variation of the species which is normally pink. Starts light pink quickly fades to white.
Thatrhodylady, <a href="https://creativecommons.org/licenses/by/4.0/" rel="license">CC BY 4.0</a>, via <a href="https://rhododendra.com/">Rhododendra.com</a>