The North American Festival of Wales is being held in the Orlando theme park in a bid to attract more families.
An eisteddfod, concert, seminars, and a banquet, as well as informal singing sessions, have been scheduled.
More than 800 people are expected to attend the festival, which also features a cinema showing Welsh films and a chance to buy Welsh produce.
Karen Ellis, from the Welsh National Gymanfa Ganu Association which has organised the event, said people from all over the USA were attending.
She said: 'We have people from just about every state - New York, Maine, California, Texas - everywhere.'
Cardiff author Peter Finch and Gareth Williams, who lectures at the University of Glamorgan, will appear at the festival.