How can I manage multiple Reminders in Apple Calendar?

I have noticed that on my iPad things like Valentines Day appear twice with different coloured tags by them.

i think I have so, Ed it go into calenders top left of the page scroll to others uk holidays press into info change the colour to custom choose your colour brews back then press done. Now I find I have just one notification with the colour of my choice next to it. Hope it works for you.