It's likely that for most activities and events, having three balanced meals during the day should be sufficient to fuel your activity, particularly those lasting less than 90-minutes. Our advice would be to prioritise protein, healthy fats, and vegetables in your recovery meals (after the activity).
If you're feeling constantly hungry, try to increase your protein and/or vegetable servings as this can increase fullness. Also, don't forget to stay hydrated!
To read more about adapting our guidelines around exercise, you might find this guide helpful: https://help.secondnature.io/en/articles/3672136-how-will-a-lower-carb-diet-impact-on-my-exercise