Generally can issue invoices for conference fees are: cultural exchange industry, hotels and restaurants;

Can tax authorities to consult: whether you can invoice the tax authorities;

Your company applied for invoices for the service industry, you should be able to issue invoices for conference fees; you can state that the rental of office space, issuing invoices for conference fees, included in the other business income;

You can consult the tax authorities, I do not know which province you, we have a province-wide unified tax service hotline 12366 in Zhejiang;