Photo share with guests

Hello, we are foregoing an actually photographer and have a couple of keen amateur family members bring their decent cameras for groups shots. I wanted to ask all other guests to please give me any photos they took on their phones as they will be doing this regardless. Does anyone know an easy way to do this, I started making a websites on here thinking I might be able to do it on there but I dont think I can. Something online that people can access with a password that everyone has or something but not something where u have to download an app or programme. If anyone can help as I'm not the most tech savvy! Many thanks x