OTA is looking for a couple volunteers for this weekend, you can either have free morning lapping or $100 cash as payment. For lapping you'd have to have prior experience enough to be signed off (consistent, knowledge of flags, don't have to be fast).
The jobs are either helping with gridding or helping with the BBQ on Saturday. Gridding is basically taking a printed sheet with the desired order of cars and making sure they're in the right order in pit lane. Helping with the BBQ is just cooking and preparing dinner.