Preventive actions: keep your tyres fully inflated and check them regularly (check!), use Gatorskins or similar (check!) and make sure you're not riding in the gutter where all the crap gets washed to.
I know it feels like a lot of hard work at the moment and there's definitely a run of poor luck there, but these things should at least minimise your time at the roadside with a wheel off.
However, for when the inevitable happens: it's not just for aesthetics that folks line up the tyre logo with the valve; it helps track down the offending article when the p-fairy strikes. Also, when looking for the object in your tyre you can flex and roll the rubber around an awful lot - some tiny pieces of glass will bury themselves pretty well and you may not see or feel them at first. They will simply lurk in there for either 30 seconds later or the maximally inconvenient time to do their thing. If you do get nicks when you remove the shard, when you get home you can flex the hole back open again and pop a drop of Superglue in there. I've done this for years and while I don't know if it actually does
anything it feels better to have done
something!