@1044574 I don’t mind using my thread for your questions 
(just makes it more difficult for others to find the answers on your questions if they’re wondering about the same things).
I prefer more a more compact overview of events: https://aviation.allanville.com/vatsim/events
ATC bookings | StatSim is my preferred source to find scheduled ATC sessions.
Just type in “CTR” to find schedules Center positions. Works with “APP” the same way.
I recommend having an Excel sheet or note somewhere, which CTR covers the airports you’re flying to. For example if a controller scheduled LON_N_CTR, you either have to know which airports are covered or you’ve got to look it up on the internet.
VATSIM UK has got a really great overview here: VATSIM UK | Area Sectors
For LON_N_CTR you’ll find EGCC, EGNM, EGGP, etc…
In many other divisions it’s really hard to get information about scheduled stations.
Took me days and hours to find out which airports are covered by EDWW_A_CTR, EDMM_O_CTR, EDWW_D_CTR and EDMM_ZUG_CTR
Another very valuable source of information is https://my.vatsim.net/pilots/aip/LOWS for me.
You’ll find some very useful information there.
Salzburg, for example, had got Delivery, Ground, Tower, and Radar (APP).
Above the APP, theres Wien Radar, Wien Radar, Wien Radar and Wien Radar.
You need to pick the frequency of the Wien Radars and do a search to find out which of the various Wien Radars (LOVV_N, LOVV_S, LOVV_B, LOVV_E, LOVV_W, LOVV_C) is really covering Salzburg.