Conversations on humor may seem light and easy, but they take a lot of mastering to start and maintain. This is why comedy is one of the most difficult of arts.
If you prepare some comedy before you get to the event, you will find it much easier.
Here is a list of humorous conversations to get you started
Take a look for something around you that makes you giggle, and use that in your conversation.
People do like bad jokes as long as they are told in a way that they are going to be bad jokes. Then the joke becomes the bad joke itself. This works. One liners work. FGor an example "You must be tired out because you've been running through my mind all day." They are so poor that they make you laugh.They get people starting to talk and converse.
An ironic statement related to someone in the conversation, or somehow related, can be a good way to get the conversation going and give a humorous push.