Drop by

Today, one of my friends will open a bbq restaurant in Suwon.

So I will drop by his restaurant with some of my friends, this Saturday, to celebrate the opening.

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The grammar in these sentences looks good. 

The only corrections I made was to add a few commas. I added the commas because it separates needed information from unneeded information. 

If you remove "today" and "this Saturday" from the sentences they would still be complete.

Ex: One of my friends will open a bbq restaurant in Suwon. 

      So I will drop by his restaurant with some of my friends to celebrate the opening. 

Teacher Beth