In addition to the invoice suggested by Thornburywitch:
add a priority service fee equal to 150% of your daily pay, or $500 before tax (whichever is larger), for each day off you need to take.
add a priority delivery fee of $1.80 for each km you need to travel, including the flights. If no flights required, then charge $3.00 per km.
add a 20% (of item cost) item provisioning fee for each item you need to procure.
add a stress compensation fee of 50% on top of all that, including Thornburywitch's line items.
finally, put another 45% on top to give directly to the ATO.
As for the wedding itself, they probably also need to provision a few cows, pigs, and chickens to the parents, and some other gifts dedicated for the bride.
In addition to the invoice suggested by Thornburywitch:
add a priority service fee equal to 150% of your daily pay, or $500 before tax (whichever is larger), for each day off you need to take.
add a priority delivery fee of $1.80 for each km you need to travel, including the flights. If no flights required, then charge $3.00 per km.
add a 20% (of item cost) item provisioning fee for each item you need to procure.
add a stress compensation fee of 50% on top of all that, including Thornburywitch's line items.
finally, put another 45% on top to give directly to the ATO.
As for the wedding itself, they probably also need to provision a few cows, pigs, and chickens to the parents, and some other gifts dedicated for the bride.