There has been at least 1 RDC in the past held in Europe (the UK), though it seems like there hasn’t been much information from Roblox about that moving forward.
Check this for some more details: Roblox Blog - All the latest news direct from Roblox employees.
This may cause problems for people in the UK as most ages under 18 aren’t being offered the vaccine yet.
Wishing everyone the best of luck on being invited for RDC! I myself am waiting for an invite. Can’t wait to see everyone there if I get invited! 
I watched your RDC 2020 vlog on YouTube it was awesome and I always wonder to get invited so that I can go there
RDC 2018 had one in Amsterdam as well.
Awaiting eagerly. Haven’t been to Cali in years, really looking for an excuse to go.
Will the hotels allow 18 year olds to make a reservation? I know in some areas they have the age requirement a bit higher.
Been my dream to go to rdc and this is gonna be my first year eligible for it! Good luck to everyone else trying to get an invite, I hope I can see you there.
I am sincerely honoured to have received an invite for RDC 2021, which means this is the second year in a row I’m going to the conference. I will, like last year, be attending virtually. I can’t wait to see some fresh faces show up at RDC and I’m looking forward to the panels we’ll be having this year.
Congratulations! Hope you have fun!
I’ve been following you here for some time now and, I realize the good you have done to all developers (and in turn to Roblox itself) with all your help, solutions, and objective and pertinent comments.
I’m not kissing your ass, but I recognize a person of high intellectual and moral level by what this person writes.
I hope you can have a decision-making position in the future of this company.
Something Im not going to get an invite to 
I really want to attend this Years RDC hope I get invited
How do I get in Rdc. Like is it randomly or picked
hopefully I get invited again, past 2 RDCs were great! 
sadly no invite first round 
Very excited to have the opportunity to attend! Can’t wait to meet new friends
This is amazing! Hopefully I get an invite and get the chance to meet new friends
Got invited a few days ago, looking forward to it! Going virtual this year due to my country’s COVID restrictions, but deffo IRL next year if I can and get invited again.
But invite we can check in box roblox or mail personal ?
I wish I could live there. But I am from Europe so it’s too far from San Francisco, and It might be expensive to travel through there.
In case I get invited I will travel to the US, no problem. Hopefully my first RDC. 