How to deal with starting my periods when you don't want them?

On Wednesday my team and other many teams are meeting in Reykjavík, Iceland’s capital city for the Rey Cup soccer sort of camp. We will go wednesday and come back home on Sunday, I always start my periods on the 20–30 th dates of months, I am pretty sure I will start on at Rey Cup. I will be playing soccer the whole time so it kinda is annoying being on your periods then and stuff.
Please get to me, the past week I have been hoping to start earlier, but I guess it didn’t happen. How can I have more fun there?
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