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.
Yes, tomorrow, December 22nd, would be the winter solstice. The winter solstice was the shortest day and longest night in the northern hemisphere. It was also the day when yin and yang changed. The winter solstice was here, but could spring be far away? The winter solstice was as big as the year and was regarded as a big festival in winter. In southern China, there was the custom of worshipping ancestors and feasting during the winter solstice. In northern China, there was a tradition of eating dumplings on the winter solstice every year. Therefore, according to the information provided, tomorrow, December 22nd, was indeed the winter solstice.
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.