It is likely that for most activities and events, having your three balanced meals during the day should be sufficient to fuel your activity, particularly those lasting less than 90-minutes. The advice here would be to prioritise protein, healthy fats, and vegetables in your recovery meals post activity.
If you are feeling constantly hungry, aim to increase your protein or vegetables servings as this can increase fullness while maintaining your weight. And 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