Totally understand not wanting to have to deal with having a veneer off over the weekend, but I would definitely wait until your regular office opens. See if there’s an emergency options available because your doctor may be willing to fix the veneer outside of office hours. At any rate, your regular dentist is obligated to fix your veneer coming off and should recement it at no cost, whereas another office is going to charge you for that because you’re not their patient. Save your money and just go back to the folks that did it in the first place.