Contact Your Local Astronomical Society or Club
Astronomy clubs can provide or help you find speakers to present at your International Observe the Moon Night event, as well as recruit amateur astronomers (hopefully with their telescopes!).
NASA Speakers Bureau
The NASA Speakers Bureau is composed of scientists, engineers, and other professionals who represent NASA as speakers at events around the country. You may request a speaker through this free service if you would like a NASA professional to come talk with your International Observe the Moon Night audience.
NASA Solar System Ambassadors
NASA Solar System Ambassadors are space enthusiasts who volunteer to organize or attend community events where they talk about recent discoveries and upcoming milestones in space science, and future NASA missions. There are hundreds of Ambassadors, with representation in 50 states, Washington DC, Puerto Rico, the US Virgin Islands and Guam. The Ambassadors are a diverse population, and all are interested in serving and inspiring their communities.
Your Local College or University
Local colleges and universities, particularly those with astronomy or planetary geology programs, may have individuals (professors and/or students) who could talk to your audience about the Moon, or help with your event in other ways.