Edit: Believe it is love shine a light, which seems to match what Eurovision has posted on Twitter.
Found these additional letters
O - https://shop.eurovision.tv/product/party-package-rotterdam-2…
T - https://shop.eurovision.tv/product/scarf-2020-open-up/
Found all of these:
V - https://shop.eurovision.tv/product/official-esc-2020-cd-free…
L - https://shop.eurovision.tv/product/eurovision-song-contest-2…
A - https://shop.eurovision.tv/product/cotton-bag-open-up/
I - https://shop.eurovision.tv/product/socks-love-eurovision-202…
L - https://shop.eurovision.tv/product/zip-hoodie-unisex-esc-202…
N - https://shop.eurovision.tv/product/t-shirt-women-open-up/
I - https://shop.eurovision.tv/product/superfan-mens-package-esc…
G - https://shop.eurovision.tv/product/cap-esc-2020/
H - https://shop.eurovision.tv/product/fan-package-esc-2020/
S - https://shop.eurovision.tv/product/official-medal-esc-2020-s…
H - https://shop.eurovision.tv/product/pin-open-up-2020/
E - https://shop.eurovision.tv/product/coffee-mug-openup/
E - https://shop.eurovision.tv/product/official-event-poster-esc…
Anyone know what the phrase is? I'm stumped.