Globex trading is open and equity index futures are softer to open the week.
ICYMI its a US holiday on Monday:
Futures markets will be impacted. For equity index futures, for example (many others are similar but do check them out yourself if you need specifics)::
- Trade halts on Monday (US time) at noon Central time (1800GMT)
- Reopens Monday at 1700 CT (2300GMT)