You also have my thanks for your time that you are investing in the giveaway.
You might want to clarify rule 6 though:
#6. [...] The giveaway goes by calendar month. The beginning of each month is at midnight on the first of the month in the Central European Summer Time (CEST). Please note that daylight saving time can begin and end at different times in Europe compared to other parts of the world. A good website that explains time zones is timeanddate.com.
You literally fixed the beginning of the month to 0:00 CEST, which is always 02:00 UTC since CEST is UTC+2. UTC doesn't follow daylight saving time.
Or in other words: Daylight saving time is irrelevant since the giveaway doesn't switch between CET/CEST. Which makes the reference to changes because of daylight saving time meaningless and confusing.
I'm guessing what you actually wanted to say is: 'midnight in my time zone which is CET(UTC+1)/CEST(UTC+2), according to season'.
Then the reference to daylight saving time makes sense.
If I misunderstood you and you really intended to fix the giveaway to CEST then you have to remember that during CET requests starting from 23:00 on the last day of the month are valid.