DD’s halls building has a building group chat which has been great for asking if anyone would like to pop to town/register with GP/come to pre-drinks/come to D&D evening/go to pizza thing. It makes it easy to see what is happening and to find people to go with.
There is a mixture of freshers and final years in DD’s flat and the final year students said on first day to meet at 6pm in kitchen for a hello meet up.
Sorry that’s not much help for people whose DC are not having many opportunities to connect with people. The building group chat is hosted by the accommodation service fb page for all the halls so that could be fed back to other unis? No help at all for those who just don’t do social media.