One pleasant evening is a good start. It is not a promise of everlasting romance, nor does it need to be. The next few dates are about finding out whether you connect when the first-date nerves wear off.
Make the second plan feel different
You might choose an activity that gives you something new to do and talk about. It needn't be expensive or elaborate. Ask what she would enjoy rather than treating your own idea as a surprise she must appreciate.
Notice consistency
Does making plans feel straightforward? Do you both show interest and follow through? Chemistry can be exciting, but reliability and mutual respect matter when you are working out whether to see each other again.

METHOD✶
Make it work in real life
Think of one new activity you could comfortably suggest, and one thing you genuinely want to learn about the person you're dating.
Everyone brings different experiences and expectations to dating. Pay attention to the person rather than relying on a single rule, and don't assume somebody else's interest, availability or intentions. A good outcome is clarity and a respectful conversation, even when romance does not follow.
THE GOLDEN
RULE.
Attraction isn't a switch you can flick in another person. Work on being somebody comfortable, engaging and respectful to spend time with — and give others the freedom to choose for themselves.
YOURS, MONTGOMERY.