there are 4 pages on admin panel whose UI needs to be improved.
events page
core page
certificates page
registrations page
you are required to improve the UI of these pages and also fix the responsiveness.
would be great if you can introduce a whole UI redesign to events and core page (they look horrible)
Note
please submit a rough sketch of what your redesign looks like in the below comment thread. we don't want your precious time to be spent on creating a BS which maintainers wouldn't like.