If you participated in different events under the same Swapcard account, the connections you made at previous events will remain in your contacts list. To access all your contacts, click on on your profile picture, and select the My contacts tab.
Similarly, if you participated in different events under the same account, the messages you exchanged with other participants in those events will remain in your inbox. To access all your messages, click on the chat icon.
If you were an exhibitor that was part of the same booth for at least two different events, you will have the option to choose the different booth chats from the different events when you go to into their separate chats.