Assuming a player has only one province(with a face up personality in it) and sudden blockade is played on it.. Can the player take the proclaim action to gain honor?
Sudden Blockade vs Proclaim
A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
Proclaim reads: (Proclaim) Reaction: After you bring a Personality in your province with your Clan alignment into play without Clan discount, if it is your turn: Gain Honor equal to his base Personal Honor. (Emphasis mine)
If you don't bring the personality into play because Sudden Blockade forbids it, you never have a legal trigger to announce Proclaim.