You can create a custom challenge as per your own needs, all by yourself. 

• Select Create Challenge and select Custom Challenge. 
• Choose a starting date and select Proceed. 
• Upload the Challenge logo, select the Privacy level, and enter the Challenge name and slogan and select Proceed. 
• Add the number of weeks you want in your challenge and select the activities you want to include accordingly. 
• Enter the details of the activities and select Review. 
• Once you have reviewed the details you have entered, select Submit.