Train
If you're coming from Manhattan, take the Hudson line from Grand Central to Peekskill. The 4:13 on the Hudson line should get you in to the station by 5:19, or the 4:42 by 5:48. Then take a cab from the station to Dramatic Hall. Off-peak tickets are $13.25.
Hotel
Say you're booking a room in the Skal-Rothschild wedding block. Rooms are $189.00 plus taxes per room per night. Cabs are available for the 5 minute drive between the hotel and venue. Check in time is 3:00, check out 12 noon.