Log in online, go to your calendar and click on the gear icon in the upper right corner. There you will find your trash and you should be able to see all of your deleted events. I don't have any so I couldn't test to see if it would allow me to restore them but I would imagine if it allows you to view them it will allow you to restore them as well. If you use chrome it is very easy to get to your calendar, go to Google, log-in then next to your icon top right there is a grid of dots, click that and select calendar. Then you'll see the things I described earlier.