Expo takes place one day ahead of Sunday's race that begins at Silver Strand State Beach at 7 a.m.
The expo at Loew's will welcome participants for their packet pickups.
The Sunday race will feature a $3,000 purse, with $600 given to the first-place winners in the men's and women's divisions and $500 to the top Naval Special Warfare finisher.
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Registration this weekend range from $75 for military entrants to $275 for civilian team relay entries.
For the race, the city warns that the Silver Strand bike path will be closed and there may be effects on traffic.
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Proceeds benefit the Navy SEAL Foundation.
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