Legal provisions for optional referendums at national level

Grenada
Answer
No
Source
The Grenada Constitution Order 1973
http://www.gov.gd/egov/docs/legislations/constitution/grenada_constitution_order_1973.pdf
The Grenada Constitution Order 1973
http://www.gov.gd/egov/docs/legislations/constitution/grenada_constitution_order_1973.pdf