Get global coverage based on conditions

Hello everyone, I would like to seek some advice regarding the following question please.

I have 3 tables: 1 is a big fat table for events of different categories across the globe. The 2nd table is a list of unique countries including country code, country names etc. The 3rd one is a small table for a list of unique categories appeared in the big table. I joined table 1 with table 2 by country code, and table 1 with table 3 by category ID. A sample screenshot for table 1 is below for your reference.

What I would like to do is to use global coverage for categories such as expos and festivals as my benchmarks to measure against same category coverage for each country. I am thinking this can be achieved by: 

1. Create a column "Count" and make it all equal to 1. Then create a measure "Total" = count([count])

2. Not sure how to achieve the following:

- Count the total events ("Totals") for when category = festivals and expos (only) BUT excluding the count for when country = US (because US is a huge outlier so anything about US will not be counted in the "Totals")

- Count the total events for a single category (festivals or expos) BUT excluding the count for when country = US (for the same reason as above). This one will get "Total festivals" and "Total expos"

3. Get the % for each category. This one is easy so DIVIDE("Total festivals", "Totals"), DIVIDE("Total expos", "Totals")

Eventually, all the % will be on the same graph (if possible) similar to below:  

Please let me know. Thanks!