I am full stack wordpress developer, and I can perform each of your 5 tasks easily. I've more than 8 years of experience developing wordpress themes, customizing plugins, improving and optimizing wordpress sites.
I can change the theme layout, and design a professional theme for you.
I'll optimize your site for all browsers as will as all search engines.
I'll install and implement event plugin, and wp-client plgins.
What type of form you want to implement, should I use contact form 7 plugin for it, or you need custom?
Looking forward to listen from you.
thanks
Nasim