Field Trip Contributions Classroom field trips are a special part of Blue Oak and we need your help to make them happen. You can use the “button” below anytime you would like to contribute to a field trip. You can also choose to set up a recurring installment towards the trip, however, all recurring payments will require you set up a PayPal account. Make sure to look for “enter class teacher” on the 2nd page. Entering your classroom teacher’s name will ensure the funds are applied to the correct account.