1) I am meeting my friends this evening.
2.) I am not going out tonight .
3.) The concert starts at 8.15 .
4.) Tom is not coming to the party on Thursday.
5.) The English course finishs on 7 May .
6.) I am not going to London tomorrow.
7.) My sister is getting married next December.
8.) My train leaves at 8.45.
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Present Simple употребляется, когда речь идет о расписаниях.
Present Continuous употребляется, когда речь идет о запланированных действиях.