Few Fix on Custom Wordpress Site

Only apply this if you can code well in Wordpress. My website is heavily customized and it is not basic theme. Here is what I need for my website: Link: [login to view URL] 1. In Submit Event page, Preview Event has some issue and is not working (showing error). I need it to be fixed and working. Refer to "Image [login to view URL]". Try posting an event here to see the issue: [login to view URL] 2.a) State field is not loading properly in backend posting and frontend Submit Event page. After selecting Country, it should load the State of the correct Country. (Function is already coded. It should be similar to search function.) b) Country and State fields are not saving properly in Backend edit and in Frontend Edit . After publishing, the country and state goes back to blank. Make it so the selection is saved even after refreshing. (Refer to "Image [login to view URL]" and "Country & [login to view URL]") 3. My Upload Files and Media Library for uploading images in post is not functioning well. It shows error after every upload and no images are shown in Media Library. I need a fix on this. Refer to "Image [login to view URL]". [login to view URL] "Area" custom field should be displayed in the events description(after title) instead of "Address" field. This is for all event listing on all pages including related and trending sidebar. (Area field should also be set limited to 30 characters only, frontent & backend). Refer to "Image 4". 5. Fix the google map Address field in submit event page and in wordpress backend. The function is already coded inside and it was working last time. My old freelancer may have caused conflict or wrong command. Now it is not appearing and I need a fix on this. Refer to "Image 5". Payments will only be released once all points are fully completed. Milestone will be created, but will only be released if all points are completed (NO HALFWAY WORK).