The number of days till March 8 varies each year based on the current date. You could count it manually by marking the days on a calendar or use an online date calculator to get an accurate count.
I'm not sure exactly how many days are left till 'Solo: A Star Wars Story' as it was released in 2018. But if you're referring to some sort of re - release or special event related to it, more information would be needed.
July 22nd is purely fictional. It was made up by the author or creators and doesn't have any roots in reality. The story was crafted for entertainment or artistic purposes.
One possibility is that it's a story of a community's achievement on the 22nd of July. For instance, a small town might have completed a big project like building a new school or a bridge on this date. And this event could have had a great impact on the local people, changing their lives in some way. So the story would revolve around the process of achieving this goal, the people involved, and the subsequent changes in the community.
I don't have that information at hand. Usually, you can calculate it by comparing the current date to the scheduled date of Comic Con 2018, which you can find on their official platform or through news related to it.