Preparing for upcoming heatwave

We have a heatwave coming up with temperatures over 30 or even 35 Celsius for more than a week. Now this might not seem like much for many of you, but in our climate it is not normal (though happening more often in recent years). Last year, we got 41 Celsius which was always deemed impossible in these regions. Our garden suffered and many plants died or stopped producing.

So we came prepared this year! Lots of mulch, we upped our water storage, and I have tree spinach growing that is giving shade to many beds. Put some hay around seedlings too. Today, I scored a bunch of old transparant curtains and found some old shower curtains in the shed. Add some 'sun umbrellas' (cannot think of the English word for them!) and I can say I feel at least somewhat prepared to ride this one out.

How do other permies protect their gardens from unusual heat and sun?

Last year we hit 30, had a very hot early summer, but I don't do anything other than water a bit. If something can't survive with little to no help I don't want to grow it. Sun burn just doesn't happen here except with new seedlings just moved outside. those I keep in the shade of the house for a few days if it is sunny. But since this year has been so terrible cold wet and windy it's been more a job of putting in stakes, tying down the greenhouse and clearing up fallen branches! The long term forecast for August is just as bad as July sigh, it's 13C right now and tomorrow is meant to get to the giddy heights of 16!