Where was the first mardi gras parade held?
No context provided
Where was the first Mardi Gras party in America held?
Point du Mardi Gras Mobile, Alabama a camp site along the Mississippi River delta
Mardi Gras is the annual Carnival celebration in Mobile, Alabama. It is the oldest annual Carnival celebration in the United States, started by Frenchman Nicholas Langlois in 1703 when Mobile was the capital of Louisiana. This was fifteen years before New Orleans was founded, although today their celebrations are much more widely known for all the current traditions such as masked balls, parades, floats and throws were first created there. From Mobile being the first capital of French Louisiana (1702), the festival began as a French Catholic tradition. Mardi Gras in Mobile has now evolved into a mainstream multi-week celebration across the spectrum of cultures in Mobile, becoming school holidays for the final Monday and Tuesday (some include Wednesday), regardless of religious affiliation.
Where was the first formally organized Mardi Gras parade in the United States held?
Mobile, Alabama
Mardi Gras in Mobile, Alabama
Mardi Gras in the United States
https://en.wikipedia.org/wiki/Mardi%20Gras%20in%20the%20United%20States
Mardi Gras in Mobile, Alabama
https://en.wikipedia.org/wiki/Mardi%20Gras%20in%20Mobile%2C%20Alabama
The first Mardi Gras parade held in New Orleans is recorded to have taken place in 1837. 
Mardi Gras History
Mardi Gras is the annual Carnival celebration in Mobile, Alabama. It is the oldest annual Carnival celebration in the United States, started by Frenchman Nicholas Langlois in 1703 when Mobile was the capital of Louisiana. This was fifteen years before New Orleans was founded. However, today the New Orleans Mardi Gras celebrations are much more widely known for traditions such as masked balls, parades, and floats that were first started there. The first Mardi Gras parade held in New Orleans is recorded to have taken place in 1837. 