This time of year, lots of people are making photo slideshows. Weddings, Graduations, Retirements and Birthday Parties are all great reasons to make a photo slideshow but they can sure be a pain to make! Not with Google Photos!
You can easily add photos to photos.google.com, then put them in a folder. Once the folder is created, you can share it with other people that might have pictures to put in the folder, making it easy to collect those memories! THEN, on the big day, you simply press a the slideshow option for that folder and VOILA! Photo Slideshow! An added bonus too! After the slideshow is over, you can send the album to your guests so they can see all of the pictures you shared.
Need help getting started? Here is a great article to help you in Google Support.