Starting fin/min before big event

i am currently a solid nw3 but i have diffuse thinning everywhere else (except sides and back). you cannot see the scalp while dry but it is noticeably thinning and lighter in color than the sides and back.

i am planning on starting minoxidil and finasteride in the next month or so. however i have a big event in late april/early may that i want to look as good as possible for. what is the shedding like, how much shedding generally occurs? should i wait until after the event to start?

i am 29 y/o male