if you go over it with lighter colour then nothing will happen. Was it permanent dye? You can buy a stripper and apply your other colour over it the same day, but think hard!
Is your hair in a good condition? Also, do not forget it may be better to wait because red generally fades very quickly, even permanent colours, wash your hair daily and in a week the colour would be much much lighter. It may not be worth to ruin your hair for the sake of few days.
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