It is unlikely that you will be required to attend the IVA meeting of creditors as your I.P will represent you, but it is advisable that you can be contacted by phone. This IVA creditor meeting will confirm if your Individual Voluntary Arrangement is going to be accepted or rejected.
In order for your Individual Voluntary Arrangement proposal to be accepted, 75% of your creditors (in terms of debt value) must accept it. The other 25% will automatically be bound by the terms of your IVA, regardless as to whether they have agreed to it or not.