If you applied for bursary, as per
https://debconf23.debconf.org/schedule/important-dates/ July 16 is
"Last day for bursary team review travel requests and make 1st round of
offers to bursary recipients". If your traval bursary is accepted that
will confirm your registration too. We need this information to give
you an invitation letter.
The bursary team will be reviewing the registrations and I hope they
will make an announcement about the criteria and dates soon for people
not applying for travel bursary.