Found the (minimum) number of Tickets for the Switch 2 Event

I've actually read the terms and conditions for once, after i registered, and found this section

2.5 Gewinnchancen
Mindestens 1700 Nintendo-Account-Inhaber erhalten Tickets für die Teilnahme an
einem Event-Tag (300 für Freitag und jeweils 700 am Samstag und Sonntag).

this translates to:

2.5 Chances of winning
At least 1700 Nintendo Account holders will receive tickets to attend an event day (300 for Friday and 700 each on Saturday and Sunday).

So depending on the day either 300 or 233 Tickets per slot (Note that it states that these are the MINIMUM number of tickets).

I've also just now checked the numbers in the T&Cs for a few other events (some of them dont state the number or arent linked on the event page though (like LA)) and the number seems to vary quite a bit between the locations, for example for Madrid only at least 950 total (150 for Friday, and 400 each for Saturday and Sunday) but for London at least 1900 total (300 for Friday, and 800 each for Saturday and Sunday). London has more Slots (7) than Madrid (5) though, but the same number as Berlin (7).

If the number is stated you can check for youself in the T&Cs, probably also in Section 2.5. You can find them for most of the locations almost at the bottom of the event page of the specific location, above the adress.