Read the rules of the race. Some local races require a PIYA lev III gear, one of which is a motor! On Lev IV boats, ie
dinghys, one does not need a motor, as it is optional, but an oar IIRC is required.
Personally, I would take it along, if it is not required for the race itself, leave at the dock, and know of the wind dies, it is a "long?!?!" paddle home!
OR, as some folk will do, find yourself a smaller 1-3 hp motor for racing, ie something half the wt of the 6hp motor, use it to get to and from the course, use the higher HP motor when cruising or the need for higher HP, speed etc is needed, and wt less of an issue.
Marty