Wow Dina such a big order, I personally wouldn’t freeze cupcakes, but you could make the night before & pipe the buttercream I would use IMBC then attach premade flowers & you’re good to go with just adding a flower or 2 to each, in a regular oven you can probably only bake 24 – 48 cupcakes at a time if each takes 20-25 mins to bake it will take aproximately 5-6 hours to make 300 (you make the next batch of batter while they are cooking) so you end up with a conveyer belt sytem of some being made some baking & some cooling constantly rototing, You can make all of your IMBC a couple of hours a head of time then pipe away, even doing some as piped rosettes will save on adding dired flowers, you could even do some with sugared real flowers like violets & pansies….hope this helps & not too confusing if I was over ther eI would give you a hand with it <3
