This is not the appropriate forum to contact DL for sponsorships as this is not an official Delta page and DL does not engage here in an official capacity (they used to several years ago but I have not seen any posts or responses from the official account in years).

DL has information on their webpage and a link to a form to submit for requests for sponsorship:
https://www.delta.com/us/en/about-delta/overview
https://www.cybergrants.com/pls/cybe..._quiz_id=10040

That said you are requesting a response by July 27 and the webpage has this note:
Because of the large number of proposals we receive and limited resources we have to support them, all requests must be submitted via this website at least 90 days prior to the event for consideration. To submit a proposal, you will need to register and complete the questionnaire.