Anyone have any idea if there will be a summer sale this year. Can anyone that actually works at GOG weigh in on this

Nope. GOG prefers several jokes about summer sales over the real ones : )

Next Wednesday, my dudes :)

Yeah, like another Far Cry installment. Just saying.

Yup, seems obvious now.
All current sales (well, except Crunching Koalas) end by max Wednesday morning (2d 9h remaining).

Will games currently on sale also be on sale during the summer event? Steam doesn't allow games to be on sale multiple times in a row, but not sure if GOG also do that.

If I remember correctly, GOG will occasionally allow a few days to pass since the previous sale for a particular title or series and then add those games to the new major sale.

I wonder if

Archeo: Shinar
Pathway
and
Renowned Explorers: Definitive Edition

will go on sale during the summer promo .

https://www.calculatorsoup.com/calculators/statistics/random-number-generator.php
You can use this random generator: and allow values 1 and 2.
Then assign 1 as a 'yes' to your question and 2 as a 'no' to your question,
and generate four values, one for each of the game. That's as good as guess as anyone can give you :P

We know the start date, and now we know the sale lasts until July 10th:
https://x.com/trilobytegames/status/1802899996213493792

which timezone ?

Still 5 hours?
Deal-of-the-day and Crunching Koalas sale end 3 pm CEST / 1 pm UTC / 9 am EDT.

Have to say, the front page looks so much better when it isn't cluttered by a dozen concurrent sales. :)