Radisson Rewards has an offer for around 180 participating hotels in Europe for 2,500 bonus points on stays July 1 to August 31, 2019. This offer must be booked before midnight June 2 hotel local time and these rates are prepaid and nonrefundable.
You can see participating hotels and book via this website or use promotional code RRSUMMER. Up to 3 rooms can be booked per reservation using this offer.
A separate BREAKFAST promotion is a 10% discount for breakfast rates and 2,500 bonus points per stay.
Rates at several European hotels look comparable to advance purchase rates I saw in the past week or two without using the promotional code. Essentially this is an opportunity to earn 2,500 bonus points on prepaid stays booked by June 2 using the promotion rate codes for stays completed July 1 to August 31, 2019.