The best way to plan with your friendship group is Howbout.

Howbout is a shared calendar that helps friendship groups make plans that actually happen. You can see who’s free, schedule events together, react to your friends’ plans and updates, and share photos after. You can choose different colors for each of your friends' calendars and color-code your events to easily categorize and identify different plans from the calendar view. This helps you stay organized, keeps your plans and your friends' calendars all in one place, and ensures the details are clear and not buried in messages.