Perms and hair color. You can color hair that has been permed, but try to use a semi-permanent or 'no-ammonia' color instead of a normal permanent color (which uses ammonia and 20 volume peroxide). Have your hair permed first.
Mowing grass works best when the grass is dry, as grass tends to bend over from the weight of the rain, making it difficult to get a straight cut. It also clumps inside your mower cavity and on your lawn, which can lead to dead grass underneath the clumps if not raked promptly.
Mow on a dry day and make sure the mower blade is sharp to avoid damaging the new grass blades. If you reseeded your lawn (applied grass seed over all or part of your existing lawn), you can continue to mow, but try to limit the frequency to reduce traffic on the new seedlings.