Here's mock up for a few pages. I will upload the remaining in next hour :) I keep the design clean and simple to make it more user friendly. E.g: The side bar menu icons are big and easy to view on any screen sizes instead of crumbling them into small text. I also used the event photo from your company's facebook in the App first page to suggest the service this company provides in the first glance. All in all, its clean and professional look would enhance the user experience and your brand image. Thank you :) Feel free to feedback !