Regarding the timing for expanding webinar participant capacity and whether the URL will change

[cmjrp]

Hello. Please tell me about the maximum number of participants for webinars.

We are planning to hold a webinar that is likely to have around 450 to 600 participants. Our current contract has a participant limit of 500 people.

We only want to increase the contract limit if it looks like we'll exceed 500 participants on the day.
If we increase the limit, will the expansion apply to webinars for which we've already issued URLs?
Also, we don't want to change the URLs (as they've already been shared with participants).
Will increasing the participant limit change the URLs that have already been issued?