You may register online for the events below by selecting the title of the event. You may also register by phone at (202) 225-1116. Program registration is on a first-come, first-served basis. Download a PDF version of our current Calendar of Events here. Messages left to register for fee-based programs do not guarantee a reserved spot. Reservations made over the phone for fee-based programs will only be accepted with a payment. If you prefer to register by mail, please complete a registration form and submit it along with your payment. Refunds for programs are only provided in the case of program cancellation by the U.S. Botanic Garden. Please note: Our online calendar only displays programs five months in advance of the current month. If you are looking for a program more than five months out, please return to register for that program at a later date or call to inquire. Thank you.