Pierre, As a last ditch, y

Pierre,

As a last ditch, you can try using small battery powered ‘tap lights’ or LED Tea Lights. For less than $20, you can get some extra light on the table to help light your subjects. You’ll have to scout out how many tables will be present and do some tests to see how many lights you’ll need per table to get a decent exposure level, yet not interfere with the guests. You’ll have to white balance for your tea lights as well. Using this method will help you save battery life on your on-camera light as you use it primarily for stand-up interviews and to light presenters. Just a thought.

Tea Lights