Are you a veteran? Have you applied yet?
I have just checked the website and while the cut off date was reported as at the end of February, it does say...
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We’re very happy with the response to take part in the parade but still have spaces available, please submit your registration forms no later than 22/03/2018.
All that registered prior to 28/02/2018 are guaranteed a place in the parade
so you can still apply up to the 22 March 2018
Armed Forces Day
Parade and Drumhead Service
30 June 2018
Expression of interest to participate in the
Armed Forces Day National Event - Parade and Drumhead Service
Saturday, 30 June 2018 - Llandudno
http://www.conwy.gov.uk/en/Spotlight/Armed-Forces-Covenant/Calling-all-Veterans.aspx