ASP.net website modification to write web code

We are looking for an experienced individual or team that will be able to create a code based on the features we would like. We have a mobile application, which allows for organizations to create events from their web log in page. We would like to enhance the page by adding the following features- 1. On the page, we would like for there to be a calendar which shows all of the current events for the month (can be filtered by local, national, and fundraisers) 2. When an organization selects a date, they should receive a notification or alert if another organization already has an event scheduled for that day. 3. Through the aforementioned notification/alert, the organization should have the ability to continue creating the event, or send a "change the date" request to the other organization. 4. Once an event is created, the organization should have the ability to send an email (poke/save the date) to the other local organizations not only inviting them to the event, but also acting as a note to let the organizations know they are hosting an event on a specific date. 5. We would like for the organizations to be able to upload their subscriber list (email addresses, phone numbers, etc.) so they can email the subscribers when a new event has been created, or a change in the event has taken place. For the phone numbers that have been uploaded, we would like for them to receive a text message or push notification. 6. We would like to be able to sync other calendars to the one on our web log in page (Google calendar, Facebook events, etc.) 7. We would like there to be a way so organizations can incorporate online tickets (purchase, and send/receive receipt) for the events they create, and if possible see the amount of people confirmed for coming. We would like for users to be able to have the following capability- for example, a user buys 10 tickets, but he wants to share them with his friends. He should be able to send the virtual ticket to his friends and they be able to download it. We are very open to suggestions that the individual (or team) feel can help enhance the feature, or make it more user-friendly.