Sounds like fun! I don't know what counts as a sing-a-long vid, but these seem like the sorts of things that inspire drunken/car journey survival singing etc. so here goes:
(From my YT playlists, I'll check my bookmarks later):
Multifandom Shut Up and Dance - MsTabularasa (which you already have) It's Raining Men - DreamyViper (period dramas): https://youtu.be/TOFps_Naytg
And, depending on how many B7 fans you have present, the Star One B7 song is extremely singalong, if anyone wants to celebrate the 40th anniversary. But very niche, obv, and in vid terms comes in two flavours:
no subject
(From my YT playlists, I'll check my bookmarks later):
Multifandom
Shut Up and Dance - MsTabularasa (which you already have)
It's Raining Men - DreamyViper (period dramas): https://youtu.be/TOFps_Naytg
Buffy
I Get Knocked Down - shadowhisper: https://youtu.be/7Uge0nZDI6g
Those Were the Days - thedothatgirl: https://youtu.be/MMzpOgL9_20
Hammer Horror
Don't Stop Me Now (Frankenstein) - Jetpack Monkey: https://youtu.be/dUbx0GE541A
Doctor Who
Survivor - Nancy Blackett: https://youtu.be/bIPHRw56j0Q
500 Miles - Jasmin Weser: https://youtu.be/fb12f3uTR94
Summer of 69 - trelkez: https://youtu.be/cku7sBcJFNo
Blake's 7
Rebellious Housewives (9 to 5): https://youtu.be/I0YK3g26ZMs
And, depending on how many B7 fans you have present, the Star One B7 song is extremely singalong, if anyone wants to celebrate the 40th anniversary. But very niche, obv, and in vid terms comes in two flavours:
Intergalactic Space Crusaders - Zukalis: https://youtu.be/vW466ObKqLI
Intergalactic Space Crusaders - TheSadisticToaster: https://youtu.be/mo8grUJBjVU