I currently am on microgynon 30 so take the pill for 21 days and then have a break of 7 days. I need to change when my break week is for a wedding - am I ok to just not have a break and take 2 packets back to back to rearrange my dates? Are there any side effects?

Break weeks are not medically necessary and are safe to skip. Sometimes you may experience increased side effects if you don't take a break and otherwise there is no guarantee that you won't bleed. You won't know until you try it.

Yes that’s totally fine. Skipping break weeks isn’t guaranteed to prevent bleeding btw x