I'll give you a brief explanation.
The difference with joint addresses in the House is that senators are invited to take their place in the House of Commons. The first seats are reserved for parliamentarians.
As for the other guests, our procedures are drawn from what the practice has been in the past. Some people are on the list of precedence, including the chief justice, former prime ministers, former governors general, as well as any guests of our distinguished guest. In the case at issue today, these were guests from the Ukrainian embassy and the Ukrainian delegation.
Then, what needs to be approved by parliamentarians is the way that the remaining seats in the gallery and the floor of the House will be distributed. For several years now, the practice has been for these seats to be allocated proportionally. For instance, if there are 300 empty seats, they will be divided in proportion to the representation in the House of Commons and the Senate. That's how the number of people is determined. So every party in the House and every group in the Senate knows how many people they can invite, and then it's up to them to send us a list.