You can export the calendar that you have in Wealthbox to your iPhone's calendar in a read-only format. 

To do so, go into your Wealthbox account > Applications > iCal > "Settings".  Here you will find a link which you may copy and paste into your iPhone. Click here to find your calendar web address.
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On your iPhone:

1. Go to Settings > Passwords & Accounts
2. Choose "Add Account"
3. Select "Other"
4. Under Calendars, choose "Add Subscribed Calendar"
5. Paste the .ics address from the Wealthbox calendar into "Server"