You'll need to be in a calorific surplus. I wouldn't do a 500 calorie increase as the mass you'll put on will be muscle but a fair amount of fat too. I would do a lean bulk and do a 200 calorie surplus. Yes it'll take more time but it'll save you having to do a huge spout of cutting afterwards. It is better to just eat in a surplus everyday as it is easier. If you have social events and you eat massively over do not worry too much, just get straight back to it the next day