I have a musket dilema...

On August 8th I will be participating in the Battle of Fort William in Thunder Bay and I need a musket.  I didn't think this would be difficult. I have a friend with a stage fighting armoury.  I ticked off the box for "bring my own musket" fired off an email to my armoury buddy....and was asked what kind of musket I needed.  French? English? Metis combo? Oh dear.  All the information I have been given about the event has emphasized it's commitment to authenticity.   I will be in an barrack rebuild, I will be eating historically accurate food, in a replica uniform so I do not want to be the nerd rolling up to the party with the wrong musket thereby jeopardizing the realism of the battle.  And yet, as a woman I would have NEVER been a solider.  And whatsmore...the 1812 fighting did not come north to Fort William.  This programme was developed to commemorate the war's 200th anniversary and when it proved popular was added to the yearly schedule.  Will my inaccurate musket really be an obstacle?