Old Westbury is approximately a 50 minute drive from New York City (but up to 90 minutes with traffic!) Alternatively, you can consider taking the Long Island Railroad (LIRR) to Manhasset Train Station, accessible from either NY Penn Station or Grand Central (typically ~40 minutes). From Manhasset Train Station, you can call an Uber (typically ~10 minute wait time) to the venue.
For those flying, we recommend flying into either LaGuardia (LGA) or John F. Kennedy International Airport (JFK). Both airports offer various transportation options such as taxis, rideshare, and public transit to the Roslyn/ Old Westbury area.