The answer will depend on whether the Hearing Loss Association of America is a qualified charitable organization and whether you attended the convention as a selected delegate.
IRS Publication 526 Charitable Contributions says this about attending conventions:
If a qualified organization selects you to attend a convention as its representative, you can deduct your unreimbursed expenses for travel, including reasonable amounts for meals and lodging, while away from home overnight for the convention.
You can't deduct personal expenses for sightseeing, fishing parties, theater tickets, or nightclubs. You also can't deduct travel, meals and lodging, and other expenses for your spouse or children.
You can't deduct your travel expenses in attending a church convention if you go only as a member of your church rather than as a chosen representative. You can, however, deduct unreimbursed expenses that are directly connected with giving services for your church during the convention.
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